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 0x38058b8b260b758c371b98630a8a0f5ffda3e5e2b734c5db164ecdb72a3a7947. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a90580ff-1f84-4763-8e27-21db47a22bb0.json and https://artists.proofprofile.net/proofs/artist/a90580ff-1f84-4763-8e27-21db47a22bb0.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 0x1f16d963c54fc4f06008a5bf51e3e43860be436a36189e839afa7ad1e0b875c6. 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/TCAFW2190561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x155023abfa2dc69ee1ae047909f39d119090fa9d4dfe232bc68116fae23e20cf. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCAFW2190563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf6caf46644fb8ce78d32361590ccc125d04eb03262d3909415e12d61e2abcbc. 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/TCAFW2190572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f331d4e63aa9d098c65d60574ae728ab386ba92eaba4facd762916388b73e11. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/TCAGP2212090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0b7fea27ca71918f1d37d822eca27eda47e3e3d671cb35255b13e503ef377bd. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/TCAGP2212106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d9e6dbb9cf9055563aca8d822494bf1c3483c032e759ecc7f4d80b95bff5589. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/TCAGP2212110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce0456b79c41f12b6ce7f4cf831b3b3db93b20930978390ddf76cbd152c546c6. 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/TCAGP2212118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84451e29d329604ecda4c28df4e2bd4a3098852136066ac0550359b40eefb2bd. 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/TCAGP2212137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd354487ea05c45ffa55d8e0e46b4d28427526696700e9f813308088635e72370. 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/TCAGP2212147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24bf39d88286a8d263b1aba5ad58b8c8b7babef88ea3b5d674615a434adb7bcd. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/TCAHD2326578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ae52e281725e137d0839155898edd259ee725065d691528c71e48b9103baca8. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/TCAHR2300272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bdfa1e2f8c74fb9cc06b1a7dae6a7da7df3793596c9e9f7c8e14a7f158b4271. 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/TCAHR2300282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b9ccb59d353beb0f8fcf341f4b5de51cb81e2ae73f60b8ee87511c05620870. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), 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/TCAHR2300299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38ff760290c94f5c9ed5567d60e7e0384ada8b0cdd2f03b72cd247cda3f8cdea. 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/TCAHR2300343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b2de7de8a1c8cb2d06f1f007263bde64f90762dc68a632416d6a328bc420e0a. 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/TCAHR2300350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9fdd735f6bde91882dd1d0f193d3cc7dd9acfcede4e72901005426f0ee572fb. 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/TCAHR2300359.