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 0xca6690835ac2cb7761c2ca9762a89019963dd7814b508dedd8ace65d4d11d5d3. 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/a9f14535-b0d2-4a55-9556-02b53a411f4f.json and https://artists.proofprofile.net/proofs/artist/a9f14535-b0d2-4a55-9556-02b53a411f4f.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 0xc7657b903a5ea4d2fde7b5ff6ac5004bcceb08460c9e76bd68a591c64d1cf3f5. 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/TCABL1228527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4894eabd8877812df8849382694377f2794dadd635a7f375ad4d788de77dfaad. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/TCABL1227218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e34d800ba9c6faa518f809a016a7f20b9e4f69be98cf88dded4ee75051e7dd8. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCABL1227224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c9aff1f05e55a3b14b7e4f30f94a3f3110bbd4262a35299b53d1ac7e3c6b9de. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/ES8241826101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02b0b6e92211bee4a0a499379c6806d8ba62a08791e1c8b554c7ddfbd5028dfb. 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/ES8241826105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x080229ec4a9fe722e400f9be0b2edb2ace2ff6fb611725fcb3c6a900f4de24db. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/ES8241826107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc7b6a9e09d4b42c84f8f1812624b1467f39aec05808842cf883d9c49cb6ffb. 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/ES8241826111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f295e697f5a95b2d4865f9646919481789fad1b3b2b6ca195460a30fa786479. 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/ES8242341202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc24f6831414cbbdde2e0dec0581af28d0bbdc47f2f9e3fa884a99735453a1602. 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/ES8242341203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bb4a085796faff376d1e4cc390ab4b21272131fc32a2b43546117b751570003. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/ES8242341201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x000126d46c0522cb71bfa7c1387bd174c160049ecf0b043893fde6bed96e99f5. 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/TCAFX2101396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5b50b6eda6dc95c829fa4cfffd41bfcbbb2ec6f3fabe3e9f96175eafebae6a9. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ES17E2301812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9650e79700c9390ff260add54e360ae0ac2aaacbc56ef2d19c73bba3fcf64b1. 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/ES17E2201447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3a1dabf8676acb0cbec3406f7947c474e4a99fcc8029636f1ea4d0dedb4b2cc. 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/QM6P41808892.