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 0x88cb7fd53d0472d5e27e25574fd10e759f2e5b811de728ce81b42cf490c5c66e. Chain 2 (Bitcoin): anchored in block 954569 (2026-06-20T14:36:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b2be1d25-b652-4d91-9516-d20a1cd7a430.json and https://artists.proofprofile.net/proofs/artist/b2be1d25-b652-4d91-9516-d20a1cd7a430.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 0x07bf8e5c5db42765dd1dfd259352bce21a7e7802f005fc0853998a4493a185b2. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/PL57J2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8267b606b2744dcd0ce30b388b7b2ae9eb16e43716cc8dcb5310006098483db. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/PL57J2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7de30195704f46b157a1125a06df5aa140d42175b068ab107c70f56d96570be5. 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/PL57J2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98e28b62688ca6b91e0bf508ee4e3c6b44204170b1b3369c4ba255821c039a74. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/PL57J2000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9c0c1568b315996a4fcb0cacf20cfcdd49d3cc6122280f1f90fc0c34f55fb15. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/PL57J2000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6510f293065a6dfa7517fc06907b20517e273b6d8858934053b8150883903d2. 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/PL57J2000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a1cbef597a20db6108d3f8b542626af555e590fc06fc560ecce946a81e6439e. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/PL57J2000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1d0fd47e9103074dcf7a71a921a77a35dbe38b9ccae52bed12f5e4cac7b7c34. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/PL57J2000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe100d70fce0623939ee5c47be4e1d24d0734ee6e9abeecf887e48087149cbf. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/PL57J2000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8baafa49d10a0afd02a9a4307e5478e991c65559991fed662a96e902e8d406c7. 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/PL57J2000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x345486a037847b73956ce6bb48198dc789628003c94cc31e9eaaf0ad8dcb5fe4. 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/PL57J2000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43cf6b82432f8ee0708218fec4b0c2ec255ff702502b3f4ba7da34b3d2d6b765. 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/PL57J2000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa15090293dbe781909d4296e49ed4508293861f3be8d8cca7b407a2c165e3138. 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/PL57J2000013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17b27ea393af82f2a94d1f81c90812661dd285dcec1f032649c0ba38fc5d58a8. 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/PL57J2000014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc40e3ec05b3722bf0166c745e7e7f1aa231967f56f38a417ea1007631ee72ac4. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/PL57J2000015.