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 0xb9c8eaf693b3fb1e252d72e4c8cdedcccfca7618f38ffc9612da8f4f101ac56c. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2a8bcae6-fc65-4072-a2ab-a167160fc10b.json and https://artists.proofprofile.net/proofs/artist/2a8bcae6-fc65-4072-a2ab-a167160fc10b.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 0x0ec48f2b0f72f02dd692b669e14649f653170ef7b9cd90e1e437576481e5f9be. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/ATHZ62504001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x405548e163e6fac6d3c69bf7dfbde7dee021e34193233191df6d09ff53b899d4. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/ATHZ62504103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2515fbe664029b679551ee4bd7d392171d4328d35e8e87ff8bf077a2ad45ade3. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/ATEJ82004501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0930cb5f8963e9b7534f73747e994603fa5bd9f499a2f72fb0f11109e5627786. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/ATT801501009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8113c24e4ee8a93d43199f05cae70a350534f43f5258a1a2abb3e23d7ef8318. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/ATFB81201812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x783e510867197e4fe9b7b456160d5a3a3253076ed825ebc640ec3b634b5ff8ed. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/ATT801715005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2515fbe664029b679551ee4bd7d392171d4328d35e8e87ff8bf077a2ad45ade3. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/ATEJ82004501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e77b9c1d6d6a604d321f9434db665d427ebc21afadb6ddb8c78f45e733ec618. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/ATEJ82004801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x429497806e4532be3060633a6bcf16909bae3a64b2e456715a0659ca76b3ccb9. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ATT801715004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bcc2ec14af939e69673a0009558002eb692283cd4c60ec8de92f640477bc959. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/ATT801501001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e7a4bea8514743cdc8b4233ade05be90940756b24bd9ed397e1b2d59c4d3354. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/ATHZ62402101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0e8fc2f8099970e3bb3b264ff04d85ba13757c5d2d740fd9a69e670efd1fc1e. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/ATT801715001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e77b9c1d6d6a604d321f9434db665d427ebc21afadb6ddb8c78f45e733ec618. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/ATEJ82004801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02b8a35a565e7032acaa4de960e9a49152383d4b389aac5d683a67e175144ccf. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/ATEJ81904101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02b8a35a565e7032acaa4de960e9a49152383d4b389aac5d683a67e175144ccf. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/ATEJ81904101.