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 0x8f032f5aad9ea8d97713bc17b63eb9a5d1b0ddcd5ea548f04cade253b462992e. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a89f6c54-f0ea-41a5-956d-c235cb1b0e1c.json and https://artists.proofprofile.net/proofs/artist/a89f6c54-f0ea-41a5-956d-c235cb1b0e1c.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 0x5be31fec5d9163d0c76404faeb706ae735c9c273f0d4b83b28d98b88b0663bcb. 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/QZMHN2312885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59f7da5ccfb553c64ff7e99b72bd493420f6b4cc0ab3590a49d8c59f69021cf7. 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/QZMHL2393009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef4d3c199577f041c79952ae392a7f7ce2e23d1e73552681cc7fe8cd52a0b25. 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/QZMHM2332872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e518e87a98d8214955cf1c3e9cbf5e7849822b318f01d709636efbaeb637371. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/QZMHM2384902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23550f568b7a20860bf6fec4e980343084fbb5796e5c3b6830ebc2e9641faa86. 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/QZS642332177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c90cbc51708a355d74597dbb0d8e1ccf4f8b19958b078107ca66eb24b139d88. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZMHN2354067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb271e584f6ad57b9b1022f21143ddca84331713fd6d9852bc247d73ea9f223da. 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/QZMHP2393261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95011bf02b0c07749b395c44de701fccf72a8c43bfd05c69010b807572ed5994. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QM42K2305117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46d48cc8c1d54545f510550f19fe0e0fd111e8fb8a002b5a842a3b6c1e7a42d3. 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/QZMHL2372014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1119321b5ffb108608921a1fd66e236abf2d1128e8fcfb66e2f9b85507e7758b. 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/QZMHM2388673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0914c3dbeb818e83afc35518dc58d4f378531ec026e2aa0719d7369479571b95. 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/QM42K2321861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x622cf713a53b8d1914f94bd7a4d0a5e0d60addc136cf3f4bca3e3959ac03e93f. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/QM42K2312261.