1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5a2e68c972ed3ef4d8dc162349fd738cdfa02113e98c8493604f0bf37a4aee5. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/19f3ba94-adc9-44a7-b7a1-6e70db6b1317.json and https://artists.proofprofile.net/proofs/artist/19f3ba94-adc9-44a7-b7a1-6e70db6b1317.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac20c17f608ef5d4e63971e3763df3c6cf55e2d281e6b3f32f9f6bf180e65697. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS182401103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5acd1b202fb1294f25457e4f37507c4a806dc63dd5529ca231f2e769de1c7ed. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INH562300060.
Kabhie Phool Dena (Pyar Ke Naam) [Lofi Flip]
Kabhie Phool Dena (Pyar Ke Naam) - Lofi Flip
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ca2c7738b9664300ef870b3661133725325762e14bdf42b435886cb881ebcf. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INUM72400609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc62d5e000ffe8ec867bfefe7e8bda7e727075eadc2862c81075a63ea7c2cf678. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INUM72400145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb4cea82e5ed98bb80c7ca3eb9681e2f60a814703b90dadb23380a5d0aed138c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INUM72400144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd988020c0211a4c60ddb359666a9e8205dc8e3e565922edb6cbe179c34446dc8. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS182500158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f524e289727a23a97f1674d1c1ab2d6ea8da559fa80676df0ede7b0ffa53e64. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INUM72400617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0e387f8b3bf5342b3a6de2b18d041c0f0e8cd7a5445d13a4e385e324eb48030. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS182501161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x002ce1d27df1f6730252369f7c4d89cd375d55741cda3943bf7a372fdaabdd06. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS182501174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93e520fe39667d94e80120f796b70826c154262234d8b49d4e10c2e45eb3bcc6. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS182501152.
Pichkariya Ke Dhaar-Pawan Singh Lagataar Mashup
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cea80865592095a8d92af3ca21a785dd1e019d3fd0757e928d617c9ea76e494. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS172500255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2441626aec93239aa0f8f508450772f4dbf4951be9d42887b4eec278a22da8c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS172500254.
Eternal Love Mix - Bollywood Love Mashup
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fd9d657fefd2aeb2d3c7e78f755a5d51605ad3894d73eb59d84cd75f5d05ba1. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS182500840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e292a071cf08d333c47611c6fed4a265223d573354ec318f98bf956d319f9e5. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS182403550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7680133887f745b31aedb4f886cf0a2a5e84490739b4f59935a8fc3740cb8946. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INH102412287.
Jo Tu Na Mila x Habibi (Mashup) [Lofi Flip]
Jo Tu Na Mila x Habibi (Mashup) - Lofi Flip
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x146b6efebabf8c78d809cafd08fd25aa854bc362656caa444989307cd07e1ec3. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INUM72400891.
Danka Baja Remix - Ganpati Aagman Special
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73f6707a608ac7c1fc2ba46b81ba82f8fe39ca5a204afd74efffbfb593bbda28. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INUM72400639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x751add62bc1742694878362e323cb3afd3040973f65a8ae82700966c2246998d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INH102410182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd5e54f54cf11aa36312de4b358ee1d91219fb399ca113112d7def24d5a9dfdd. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INUM72400631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa627c4b7442fc7e769454985d357f7d59f527b3008eb2d2057b269ed24232ef. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INUM72400603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb416fa702c7a775ac43e135e57fb73500a43c445621237433d5ec29b98c6504. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS172407654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5347a4e1d9faca52146b6a44cc7e57cc57e2a827f4ab40c371f6460fffa93122. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS172407653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bc44e1e7a421ee9f396bd35dc374a7917c763db5f51dbb109a61a7075e98099. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS172407652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0efcda2abe661328048dab5759d05a9757ef87ba0e44c9a758268c844ed8f3f. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INUM72400355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99c2d66763fb6fae8b16daead22acfb23b7c0fcdb8b14dfb49d8593bebb28eab. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INUM72400147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e19b7a1314f86e93456eeb7acebcef72bdd4c756a1a5bb8bafc3a9f6a7f9d6c. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INUM72400146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe1e0fe32e7562261d4acfcb5ac55a4da7cd1f0e960ece3942a5bda5f2dd110e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS182303724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd562caa91022ed9292418b7957ebc4fdd44798229909bebf885be1e165bb9c9b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS182303013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00e77db3d5a9de8a771d1eda018abdb344ea4162248ad8e753ee4a898d2d53a9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS182302973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6de53cb283848c76e6532fc155b219838180cb4a079514ac12effa8949fbef61. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS182302957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb25afdd663f8ffa7c5b0426554c9e3b5a2038601ce1de2bdb721706583731991. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS182302848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2c68b116c441ddb42f951a4140c9dbfa2021adea286169823ec2570fe3eedc7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS182302426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7af0cea77be0630596aecdf1e59acffaa7e785cd89b4b3342b00696a92bc1cd. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS182301107.
Rang Barse Bash - The Ultimate Holi Mashup
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55422cb92edb20a5b1a583ecc8e6f6456fa94a42e874ff1cc13d055a1ef23e65. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS182401004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e1f0f161c53d338b166dc8ea30ad85df884bd0fa54383b1a367c4a3b09ddf7d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS182303776.
Best Indian Lofi (All Time Hits: Vol. 1)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x463c375f843721e047f575602d7956bfdd6b37a11df81ca736c48f36bdea5787. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS172201689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb97bf9009f17a49aaf0a5af01671290f5204aadfa1b5a1c5999816bb125c2d11. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS181602124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x476d6e3d040d3979715c85d386911b0e3550bce99976d197da0494f5a23ae9c3. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS182201761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc387ad7ef2a63b34d1a46d5363a0f8feec54222f9f2c88e2fb22468e45c10350. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS182203842.
Hearts On Fire Valentine's Day Love Melodies Mashup
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95dc9adc2ed57d320c37e6f3f45f24f5466cd2e0e486930e5e9ac165a612af84. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS182400443.
Aap Jaisa Koi (Film Version) - Chill Mix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c2a0ddf1117a7cf3cf44a6d1bbb3f6f7a3a5bc18b23e9ea97e1993ab9e85697. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INS182303371.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch