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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed27ad66cc3d006e53145a7bb5952c40a597fa2430b35a6be9d0685238f617d1. Chain 2 (Bitcoin): anchored in block 953762 (2026-06-15T08:21:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b911ff9c-5ad0-4de3-afeb-3f5b894221af.json and https://artists.proofprofile.net/proofs/artist/b911ff9c-5ad0-4de3-afeb-3f5b894221af.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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f52b42631a2cde3be791386739909fbc7437160c6f18b355b687126defcf40. 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/HKG732374065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04ad7889351516736382a0a85467ecaa502dc86dc48c03d27e33e147c1d12b9d. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/HKG732374066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e7182177e4e8bcb0eea8ad2b4f7e1b3de0bbbd1267f44bb5b2f2d4cd5568d5c. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/HKG731402282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f23182d0aa25ef749c7829ca0e5557521af3182a32ad872b86b025ba63b13db. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/HKG731402283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x867f303e3804d7fa9e3741e4d5d8ed9e825ba12d62bd9b9c70418fedb4177104. 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/HKG731402284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc31e5a8065365064baee5e4d494293d84717eeaf59500aa300ac6d2e86abda35. 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/QZZ972425768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c4faa8bb967392de29a98cf289a0374aa6d6965144b0728823eb5561f092262. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/HKG732312631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc236cb64dfc7e7defc564855b08bd177f8f939035104b5c39443e564f29e104d. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/HKG732312632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x152e3c1bac089d5ced428462fac59f7b73d89fe1464e4349d7cdbf2c39bbbf4c. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/HKG732312633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x074c5d66ffa8717c53a888369ac701ff075fc442f1e17e8b914999bab883df67. 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/HKG732312636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda11f8626bb630a909a3898b58d4423c231cc12726abd237a10035c876e8bca4. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/HKG732312584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640596d44844b3c966dbef72b6465362d72009e91a4e51c25e418eb58e73484e. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/HKG732312587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e909c8121909d5a67fc60c8dcfc5369a7c1d3a26e0f60a7f0c2805c1037ea16. 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/HKG732312564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7125240f937436589f51d854a6f48df062b6ab0d985e4b0a2eadfa8610b06aa2. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/HKG732312717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4227787a85b4c37c2b289fa83017682ed90b1441f2a684a3807851d4cddee90f. 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/HKG732312530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4799d0640d0f74be7de0fcd0e70bbab6fa60bac1898b9a8ed41b7eaee297e356. 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/HKG732312574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7ab3c328e3ef8847c97a3638e1a0d97f25ddb8aa98950eac9924239b75d5734. 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/FR2X42155524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9283798361339218d4763fe9a7d9bb0ccf5f60f637cc75c394301b3422fa4c6d. 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/FR2X42157846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb99ed293861f14f65bcda5c366a0c7c822540b17186560ba554de5cb1cdaf7b2. 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/FR2X42160992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb03a6602f0a273a15f2f000207a49b87e8c390f4ee4f50f514e143e5032d308e. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/CNZ882302293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2986d2784f0aa22fdffec0cb54fe0a3d6da51e43a05d1c58f9b3b4da10aa10. 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/CNZ512300072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1d79758a0ad2f5b0e71e3a4907d22467416b88fb42c8b9eb21af3b6077a382f. 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/CNZ512100573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb85d00e144c66ab8e194b841e90b1cf9fd7a75461510f1f4555c404b7bb5495. 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/HKE022303242.