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 0x2ca359f3d593ba4221fa32993dd1309c2a85251ae94075ffecb4e7a5e01f4390. 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/4bc16e7b-3110-43f8-aa0c-28f9f65d6d91.json and https://artists.proofprofile.net/proofs/artist/4bc16e7b-3110-43f8-aa0c-28f9f65d6d91.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 0x365295b49efcd2dff2f72f41577bfb8d60ce4f5fde4fed975bddc4dc4c9cf060. 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/QZNWV2100132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac701c57814118e7947538c030debe9b5663086e4bb798383aaa6d0a4cb98285. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/FR96X2228327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58e76359fb2fe381894e85fbcabff83b43d5be15ad43498eee28a5aa092b5519. 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/FR2X42332697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cd9dc757068b95134bb44e1a9827f17db2238aa18ff462535a7200717b98316. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/FR2X42332700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x272c8ad26dd7a6321b0402e95a8e15de85a9b00ccc7dc8282f2516cec7c4efdb. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/FR10S2348456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f41a8b82ac1f1a7f53681d55112f865eaf21a6183e6d0028d0c3b337dcf050c. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/DGA052349805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fa1c5f498f9b42235437ec1f6cc0c7deeabf5d9fc44adbb40b38930672472a9. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/DGA052349446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb16b4e6d9f196f7f417a67d64fb12782e04a9912197cfc8ff3ce9e2fd60ccb14. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/DGA052349806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b3e706f91b171538c4228cbf1ada8a88eab6805b56c870670108ec35db61a2c. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/FRX872300178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x067246c4b702fa2fd9b3de37cbe81422d7d3d84adac7e59a236641c9962542a7. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/DGA052349809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2a83a32476637260fc6ce49fd501cdb12c2f14705985d4282fffd52f714605a. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/DGA052349811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05fc726cd5178db76236d818a98aaa273e4cb2054afe36e8e68ddbb3352a2424. 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/FRX452331193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd85638c7773673710b674cd147d4a99913e4271ef1f2a690cbc5b81cc7de7376. 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/DGA092348018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b016ed215dad3e2a7e95be186984de92ba4ce788d7e150275d26c324fcfea5d. 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/FRX452474319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x975965faca12ceab9d6b91de3f6f9061c4b62b3e72c9ecad4feb6842049b4455. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/DGA0P2436711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cf9199c586de65a68bd6958bcdbc5169e40878be3a459dae5928be2dd266689. 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/FR10S2598553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7fafdb36868489f96dcd6d43808781fc7f83b5f8f77f052c18c3976d499e730. 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/FRX282524893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c93ae28e65e651cb6e4e963f82be10f0cbbd979a5c63f6ddeeb90a09c2a02ea. 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/FR2X42586947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42f311298eef7cd21ec05c0b97855a13fa1cfc5051911e49d0c740de5e5f3465. 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/FRX282524894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2b580c8a353b203330828cf3618f6a9a8deafb03f7de5bbdd3b79734fdbc776. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/FRX282524895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cf9199c586de65a68bd6958bcdbc5169e40878be3a459dae5928be2dd266689. 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/FR10S2598553.