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 0x8c7a8a912924cdd8e6580e872fe8ca191f1d8b439807f6e2e7711288c54acadd. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eaa010c2-b83d-4598-934e-ea177477a8f2.json and https://artists.proofprofile.net/proofs/artist/eaa010c2-b83d-4598-934e-ea177477a8f2.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 0x4616754d0cd3b4bed27d1863c1f6d07ff324a04b6df4187443a8e365436c8d71. 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/QZHNC2211336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ae344c3884c729ebf84944fc4e36f107dddbcb5533848c577d5b415bc5ca02. 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/QZTBC2385388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x217c635974cddebcff327d6b9d2d8615baf596f90f8ab9b9bb11ef3b085b2517. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZES62255527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x332c3567785374c30d3722e21d1fd12b1043ed1c07706841717a1820a8a9cf94. 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/QZNWZ2499850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13d9f69d8764b91663b8aef6c778f648557af1ce41873e78dfe989d2ec3e784d. 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/QZNWR2414172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66062891242ddf15f5b1fe09e7821eb7630f9297d0e5e36fcd29d484f1cff330. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZHN72482951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda4a6926b69d8081bc82f71fc61316fa2f29025b4066d0368bbbda91b7d993e4. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZDA62430245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cfcc6ce57694b8f5111b4b47c438ba4a1411f927d93f05b0d283bea91eec6c6. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZTBF2309407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf571a56f63328790032386458ea95e921f4730935d8d2a267f3816be4527ea79. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZES52372042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38fa49758ad29cc172883e34d8fdab9e4e1f474d1f5a2816048c27d235d193f6. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZES52372043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc9a5ee8dbf08bff56191ae3adee9888fd0ba8e428d47de38afe5aeb197f1f26. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZES52372044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9d55e44e5d5d86e35471a381e205c3a0f37c2f32aa7f1bc9f6f919acb1a4098. 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/QZTBB2224483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1da678379641afd21365bf8137a144a8f405b777d7189f787bb1d14f48b8367a. 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/QZES52372045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9d55e44e5d5d86e35471a381e205c3a0f37c2f32aa7f1bc9f6f919acb1a4098. 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/QZTBB2224483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc260f4fa786ae851325214d48c6fe2c4e9b5e2a49dbfed36f489f089b7241d41. 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/QZMEP2277771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1062ba8ae4574e19e2d237cd3622def296cb02e76fd0a41084f776e674a29ac. 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/QZTAU2143223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ce309b1f01625459ae77b32ed1dee18def305b0456541fce79b8bb90f46b3f4. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZFZ22197071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27b68c1bbae8b2c073a7957626c9ae527140ddb62aae8140058611b7f08d03f1. 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/QZK6G2035042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdffe58196d51e2e61e5951686ce2b57f0a78bc2bc022e777a2f73e83526ac8f7. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZPLR2265982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62463adf94da07eedd0b3233a3cbbcef21c54c53d0e1498f0422197433ff0276. 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/QZHN72317743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79df3a5139bb93ac1f0a05b14fac5f0502fcb3574a288ffaec0fa994f6b5eb7a. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZHN52348224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bca1bbb92f19fd5defe2f19d864d7764070a564f3645ad27ab91cff388ffd70. 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/QZHN52348225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26af994a0b289cad3dabc9167bab3785f31c628eb3e7a6410ae6e7c1b371c92c. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZWFH2401736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54b4d5220262794a91c08ca7e59db92261d0c681ee7a991ed57f6e991d2ae766. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZWFH2400354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x724859777b0532b5bda07bae839939e532f280351c6190819b1819ba88535d01. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/QZTBC2496239.