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 0x93310a2adbe5eb034dc21d0e15fcc11afab667ddfb39603620b91bfc2bbebd86. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/89f46ecc-a3f4-4d80-80c8-372c0e34918a.json and https://artists.proofprofile.net/proofs/artist/89f46ecc-a3f4-4d80-80c8-372c0e34918a.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 0xd7eb69cabf84613dead1d03b9428faca4495039b203165973f0abe4389b101b4. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/AUH5B2200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe19a27bd57bf4b48ff8b268afa427e1c1a99164cd3eeeed11020913e373cbe12. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/AUH5B2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a6e9601c162cf72ab5e5982a1259c44b656e0005226d32460f184c82d1ef790. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/AUH5B2200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25455ff3a9463abc05150fb9b9e10af790bb357cf001148f1254ef1cb9541ae1. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/AUH5B2200012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7e6547d1613fd7d0dee296e872db61e5bbbabbf4095deb749c0e305bd8a17eb. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/AUH5B2200015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x325f17d6e1b3c4a8ac63e693d5c8cf6be43305d81d73c9091f6f7630bded228b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/AUH5B2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe2c5ac816abc4895950ea378a1404e86978691da4a1c22e7b08bb34efa06eb2. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/AUH5B2200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0847d21973eb03cc6a2f8c2ba529223eb32e769306105d7f97214dc268e0905. 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/AUH5B2200016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x924871187f7ca6be0a26d362c3fb534a874c80d396db1a28adc90756cee24860. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/AUH5B2200017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f9409b747e7b9133746f02f0b76aaae44df32b23f9f05846759c654301d12cf. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/AUH5B2200018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdef56249af1f29f7f7cfe90c7eef735b3b655f2ffad66b668b7d43390a6baae0. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/AUH2B2200019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb561c2aa6ee696e4c6a8c1f7e02cfb64a57e2079c8a0664a0b3820201b5d89ce. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/AUH5B2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c46e24259c8e3576cf18bb0a5bae075056dee72a14c315445947ac7e697c30b. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/AUH5B2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8430786b8e79721b86be8a379867c8a7bc70196cd6983cc23aec30a3d2d64227. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/AUH2B2200020.