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 0x0487fc45b6b4516774c18cde0597b1239e9c4f4fc790ae400aeea6c9825916f7. 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/085f31df-f7e6-4621-a61c-69bb0b13e577.json and https://artists.proofprofile.net/proofs/artist/085f31df-f7e6-4621-a61c-69bb0b13e577.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 0xa05b689274ab2742541d2eb4e947d9a11cc7f1967023d19f71742976a77479b5. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/NZPB12201211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf4ff4f85bfa90f173bdf41af9d1c528f3719bb9981fda20fcd402e0b775494d. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/NZPB12201214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a4f5adcff38300f9986fa413c68cf1f51d5d48878e0a720ba050da8715f543a. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/NZPB12201215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd670728cbdcd2feb28a92770b476cea2830c48fb76fa286c7de0a49f897b802c. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/NZPB12201216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0713fd7d8864ec6f3a6a0ba73e73bb56a6a39282abb4d1f4289974d4aa61725b. 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/NZPB12201219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa400bcc1c9fb9f2b9b81a78fee4c2beddedf18a0aefecaf09edcf979cf27cb21. Chain 2 (Bitcoin): anchored in block 958668 (2026-07-19T05:16:11Z), 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/NZPB12200868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bf3de9c4484ca33d860b83382054de5c6c0a78200146b40d293318d43e4ac65. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/NZPB12200879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b3ec99c83073f696b45b9aa1b4a885b96dd96ebb92f0b58da12c32a582c31de. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USJ3V1242932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae42388613f97240176cc9886f28bd1a8ba052d14d931ad8e26c0e80341349d7. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/NZPB12201225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bd6932c6dfa62604b3c556cd930d8ea5dbceb1659703fc9a030aafea45036da. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/NZPB12201093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x021730e23dd995dcc62d8376cbf926e562dd976901c3b1f0f5438c0ac68f9121. 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/NZPB12201245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85d25f9fdd429bb8afd8138a651bcc426eb4c5c54eef86fea2f01decce288f80. 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/NZPB12201291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6155af8b01ef039597243a5ac4aeab0b1e000b7bb4d403e70facf9d4015c0d58. Chain 2 (Bitcoin): anchored in block 957550 (2026-07-11T09:54:43Z), 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/NZPB12201295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x900672bef637b2d3e925323b43d0cca8e7f4fe75bf44d9a6e3794a47e9e0da0a. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/NZPB12201297.