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 0xc35c0421ca1e1cf57f69ba0de56d042fe0169bdb1cb16b572d07eba8035993d1. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ca414b85-b81d-433c-9fb4-b3e4f53e3f50.json and https://artists.proofprofile.net/proofs/artist/ca414b85-b81d-433c-9fb4-b3e4f53e3f50.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 0x04ff87fc9c4d73c43ac3e0c8ec4532b0db7e4f6a13f6816e8fdbc59d3efd3e72. 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/QZNWV2150276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fadc2faf828591b33f79acc483f33f300fd63641e47944b87a05a240522c944. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZNWV2150279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5089ac15d4a7021ce218f9c822d96532167f4874f38483fd4a5a42b68ebfb5c. 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/QZHN82352622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcecdf1d7fbdeab6ad4ff174310be5816d4da7d0990865e99b6b0f3e7b1513082. 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/QZHN82352624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7265cc4d0e84f2fcd5eb29274799fef312e5e7b42eb0ed53cd872bd765c12b5b. 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/QZHN82352626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc18ac8fcdbb7ec5f0ab2a07d1cf12c16dfcaae72122efb69d7570ae0ab3f8a63. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZHN82371596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9e337e5886ddab07976bcf3a5d1e65f47a856d69379b94224ad304a364dab02. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZHN82371600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1929bf023a941e714dfe5677f717e1563b01da3d4794eabe8f2073b9edf4a48e. 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/QZHN82371602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x490421c1226aa2b5902caab6727ca2b5cbe7467448a36fda3860cd8a69ebaa32. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZHN82374174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58e81f383b158927c93997a6f3808135b88d3b9ee2e75eb33f0b35eaac068396. 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/QZHN82374175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x905501961f1db6b16015edbd27118972bdcb7f566c5e6aade28f7ffcfa2a879b. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZHN82374177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43bff478ebc7fbb0fef443936386947c06452d5ec14e3d9a8753b20dfa4999da. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZMEN2437465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1da6d0f8e6d1809ccd9f838028eb0454d55978fc28752cb3d8f72efbff538ab. Chain 2 (Bitcoin): anchored in block 956841 (2026-07-05T22:14:35Z), 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/QZTBC2499488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8fed541af71e9b9736218a754006a32ff039ffef3d2ce55a3d9de47f5fe3edf. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZTBC2499496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6650ad621d67a75f322b6011fb1d83ff7fbc74ea7b8f2ae202d591a06c35a755. 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/QT3F62595361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a0a3a4a2e411aa17b4883df1254e5464402eee88723ce5ecd0cc10eb32ad271. 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/QT3F62595364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x053a8a38ace1b938b32fbe674fda4e04bafe65c9880add5b0e9b69f3e31d60af. 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/QT3F62595362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54f3ffa41b144beddcb19ac42619bb9bc056f98fd455f5415d0c3653d9782150. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QT3F62595306.