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 0xdd80ad9dd64f6f80aaff247a8101f011dfd2c4fbe4535b31aa49e722c99279c4. 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/f64cfefa-f555-4e73-b7cc-d95ef64f89b6.json and https://artists.proofprofile.net/proofs/artist/f64cfefa-f555-4e73-b7cc-d95ef64f89b6.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 0x4593208d026700878bdcddd2d330a8d0a5e1ef500ed5587e14f08f4871b4df69. 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/QMPKX1872147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a7176c4970f11a4b1f83b3daa0ca5bc83f8229eecd4fb932cafdbf58f581c89. 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/QZES71957430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7fbf62134b6e0e234d30de2f4956ecb533fba18e37cfb37cfbdd21870db23ef. 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/USDXS1800312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb528d28c207212fc011589b65bc777c50a5e36ec43cffa0bc41220b2109df15. Chain 2 (Bitcoin): anchored in block 958724 (2026-07-19T11:19:01Z), 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/QZES71957432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe23d0f4239f8b125a41320f43b418dbda5597383aa060384c8bd57375a010a18. 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/QMPKX1872148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecc2d8a73007de9bb966a7a2b8a58507be968b659c1a18fd3e540ac734f3199c. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZES71957433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x630c783e60e96a84ae60f4be749aebf7c8de312fb9e63296cdaa241802bbf18a. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZES71957434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6776cd5df311e674fdd5f3b9527b9a92b2dd8d4d9df64e75ac7ff0fbf3d9f87. 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/QZES71957435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98876282e1419dbbd041aa6ce46ccd4721fbc75755e2b8b3e41bf9346780e53b. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/USA2P1947557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6fd0f1fcb8a53186d1fea086b421045bacef0c597fa01bd3e4c0aa6936049e2. 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/QZHN61972414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34dbab0f7dcac37dc97a2d4a41c81de8528282e67fd3e0888fb6b3d97714959c. 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/QZK6Q1917684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bf5d69a654677b5c1da3cd1128c3e51548ec4a777c951217a6253d0fe36004f. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/USA2P2029668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f1097851c7db71aab41b27778f4830e0a47282e1d36fd3e26d101a7aa58ebe. 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/USCGH2153923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c9d1c4b55fb8c869cbffc81552643eb1c07ee430d95d417842b4c4d0ba7ad2b. 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/QM7282547785.