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 0x903f92b352b34782c16295703c2edfebfaf4a5f5701644d515e9373ec3d137e7. 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/15651a16-f3ff-461c-b667-4d28eb25e646.json and https://artists.proofprofile.net/proofs/artist/15651a16-f3ff-461c-b667-4d28eb25e646.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 0x20200315afbd145b5e697f7dddd8f7fc120ec07c03f21b98f3e775b09625245a. 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/GBKQU2219429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fa72ce65dd013d175e94805fd6411f595e829becbd3713d430ce68964312fd8. 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/CA5KR2239709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x667ef4aec708025a7943f70d573eef791e3aa26d5a4cbcaa73917ff674f1dc2f. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/GBKQU2290328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16ce89aeeaf69b795ccb964df867fc71f369025efc70f27174bc020ce3be1125. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/GBKQU2290329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f680b9bdf0fd7c7e0791eef87bb50e2998f2b669d29a2e572c72c0bea3b1350. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/GBKQU2304057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7647ab2b851b96c036bc712a06c632902e7e01c0967f103abefe841b7bf3e95. 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/FRX872337593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec65f1146495716f435ce81b6ab977cdf75674f134c9558380e9fca207064ff8. 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/FRX872337595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcfc928ca3e48819e7ed44427603487d81a0cdecd26e092f094f0e74d3bfd4bf. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/FRX872337596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6b15a8a7b73de72856cd0c87f3f39acb6453ae1a65d1e81311c747734b53724. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/GBKQU2376907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25dc68423d2f62abcfe36b2d057b96c4819e146ea9afde42d5c815e1b7f30db4. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/GBKQU2376908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41a37663021574b5ad270eb8757a39a603d7ac256fbf926cc88bb06df81415f0. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZDA42490297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65e0812aafb823168c732607c25528049bf4aef21b0d600f49b41191b5d55819. 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/QZES62515611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x033d8fd0799bbfcd2315911c4cdb65844a8f76cfa325937adae41b65978dfa93. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZMEM2506777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x389059081fa99b8a9a065b737a8a64acc514c76e5f7f2a1cdff7bc10693327b6. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZTV32572091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fa78fe930feb985775cb75eabf8398c60fa422616e83102a6c755c6c7c6a42a. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTV32572100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1de4044a662de99ae048487f2151c0358b997ff9b11860c2811024d6ebe69256. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/UKR6V2521217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f0250e460d4f838b829c6f586fcc7c4e4e59f827fda2725e035471601ebc906. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DECY52201207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46660a8f6acdc6cec55991de0ad3004ec4fbc1a7668631949ac1cf4c9336d56d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DGA0S2476444.