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 0x709dacfa48449e346d46414350bebd0504c9419a04e3664e7a3c3f19cd273797. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c690cd19-867e-4eb6-9cfe-27cc33c2c2fb.json and https://artists.proofprofile.net/proofs/artist/c690cd19-867e-4eb6-9cfe-27cc33c2c2fb.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 0x221ab3b77a4f9431e2fea50db9089e5f53a57951fe56fd0b762eb87cccf7c5af. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/TCAGK2266407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6b6c18fdd5842c90dcf432532fd23dcf7af64d3403cd1115ab69b3540d9e8c9. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/TCAGM2204510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb89e2201ad5a96dd169510f9238c1e54f3a4c6118b5a6a10a7bfff6678f015f6. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/TCAHB2348556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x948f643f9d3deefe7d5e53dd932e03610bdb5e4b5d3af52015a2b385d6f01e94. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/TCAHF2324162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd209f27b450b93bec552585d3df772f30aef72a7966b106d471b3b8c2a99f4e5. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/TCAHF2324177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf16802d15bb43b1be836700a6e0e73166a36b568e81ccf0f3d5cc4149d9f071. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/TCAHF2324187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36f7862dff340a52a2d2ec5a8fc8e113306eff745ae372db2ae4b8f8a14ab943. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/TCAHF2324196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cd9115dd3aaa7881de161be65a286e48362609f4cd68ea6c61409ae5ce09803. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/TCAHF2324207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7902d9ac6832df33bbd85631937a9bb3afdad9efa6274b25cccb605378a7024. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCAIU2427467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3de25c905e62ebcfcc0ba7a225efd448521719128e6a3295775fc49536b7f71. 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/TCAIU2427472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x123b9648237b3ddaf4ebb01fc1c72cf86e8ee2bd4a63b99acfe90032e0895d7c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCAIU2427485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56dbf18bfdfec975f0f51e9b9c49eb5e7f92c9362efb5989862be7a582778984. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/TCAIT2427489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b4ca4b99cbb4e3deee85de7fa1fd29798926b39897ea6e4242b2970593bbcd6. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCAIU2427501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6b3ee330497ddf55fd0c81f705475777f66c2f757a534251341416c90888a8b. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/TCAIT2427505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5274e9c5d6b93077f4281055f8ab40b168e188f38e417cf45aac1fbcd2b021f5. 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/TCAIY2434797.