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 0x9eda746cd1ea33bd84bf9c1d4de486ff8800f21a5d8b21a33effe6372948929a. Chain 2 (Bitcoin): anchored in block 954580 (2026-06-20T17:48:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b6155da5-e11d-4c24-95e4-2c84f6a7ce11.json and https://artists.proofprofile.net/proofs/artist/b6155da5-e11d-4c24-95e4-2c84f6a7ce11.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 0x2352052bcc65098ae5947de7ff8a8704d5aaa8ba3ed4ede7b35bdfc1c680a87b. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZZ8A2487557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c4de425441cccc276423cc28a6e05bdcc5dfb1c970f8c60fb6f1e4369126f85. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/QZZ8A2487558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c75a0051bf63b7f5a79d4b63455b0402202640e67e3e21640c106a3cffed58c. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZZ8A2487559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77d059892709471d51e45b9921e754fb9fa8ba5cb959035fb6907f2546776288. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZZ8A2487560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6160ceb107ea190818d745bc5021e4387661c9cc9aa2d5e19b6bbb91f012a9da. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZZ8A2487561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92e3b46ea5515df1472453e50d233f487999261918a8f471a8da14af5a0ae32b. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZZ8A2487562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a37a2eb8c8eeeb5111a8834b95697b4c80195230a351b6f16e6203bbe7484b7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZZ8A2487563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacc77ee7535648ecb249fca23a1e87c235d0c303aefc1c84fe9031c98f61edcb. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZZ8A2487564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b936adae74a3c3f2353a361f0a4ef1f170b343443bab317991bfbb23102fc8c. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZZ8A2487565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x550240e8a8e213f01c525efcc95e14e74c9e40bdc3a3ce63d8c3313bcd42eec3. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZZ8A2487566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c4630aed9f153012e810976cd3feedb0e73a544527948a71af1077fa0859eb5. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZWDD2375566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6591eb8b1f50574eb8df7df884c8cfd66707d05d7ddacd4589d97475a314a845. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZWDD2375570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e88a4a34ff7fa5beef3536761ce9ea08935a1259e0a5e6c64f6f7e6c186b3fd. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZ5FN2229893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf7c3241ad2fb2312775da07811992ff29ee5b4fc5f8f7c7a4be0b5ffd7e98de. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZ5FN2210057.