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 0xc3a54bdb77d0aa8892a61356ea8007a5841555699edbf482e70e301fd911ccb6. 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/f9ad97b0-fd78-4a00-a1b4-98942de7dbfb.json and https://artists.proofprofile.net/proofs/artist/f9ad97b0-fd78-4a00-a1b4-98942de7dbfb.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 0xd6923f02b9ea049bfb1ea890d1b536b1d5571168171d77fe5bd224c9435b777b. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T16:11:36Z), 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/IDAC51999199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd22f6126c99ab9d94c76a333530b49f13b2b44e8cd262f6a7193cfa354885aef. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/IDAC51999201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28dbcfb01e53705897278d45b40fbfcfba5545f995863b4a49934707f6e891f4. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/IDAC52001567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f1d831748d5009adcd9216595edd1d957bfb37164fc059db912e14e622dbcc3. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/IDAC52001568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a3de452f7433e18853db3f7387d3f910c488bc859e5dfa4ecc36dedb6059e25. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/IDAC52004132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x764fa1ecc0aad38d6f78e5746d6827ed6a76f85399addee237dfb5117b68bf86. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/IDAC52004134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcabb5e738f3fa259845285239c54054407a6f389646d8389ff588ec0194ef640. 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/IDAC52004135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x508b612e7c83027ce288e00bcf46c763bb8a0e782e54370bae2ef9ef7c73e136. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/IDAC52005088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c35390de60eb2b6b29e05889d3bb3b3e979b33d8a61ab060b592872dbac43bf. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T11:59:25Z), 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/IDAC51999198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3585dfe31bb7d8b9199fdf7d8f329d7e1bf751a04dba8700b49dd8aef55812a. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T19:46:18Z), 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/IDAC52004130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bfd1106f467e1e703de91d7aea9fc9289b9b801c5caa33b668ac151c355dbe2. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/IDAC52005089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x625f45c2194c60ac2dde3d650d3f76d36a16c12536efbb7c6d08a89e330f946a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/PT4CA1433629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10b295cd41f9aab4fcd520c65cd4b199584861fd4c950140ddfe12525e3797cd. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/IDA042183102.