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 0xa421b3b837f79bba23f80caf1498aaaed3631637cbfc2f109e2a7831a63f14d1. 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/0bf8fafc-9179-4a04-b813-0312a03e6d08.json and https://artists.proofprofile.net/proofs/artist/0bf8fafc-9179-4a04-b813-0312a03e6d08.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 0xfee62fb6d70b7a89dd872ece76a6cea04f0e682df3aa9137dd195d85baccff1e. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAJB2448148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd708af0d4acb484b37c9768826d4894806234bc8bb7d93d811c3b157761660. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAJB2448151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x179bfcf234422d7e27727f2b822cbaf6a5ab5ca59cafba4fa22cdfa8afb1072c. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAJB2448155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fb81cd9b53e33e29bba1e63a023c11e2fc220074d19f3f1f21a5a00991f857d. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAJB2448160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa250aa744f80b278abae0d99023ba9feda81614e9430d5878b1b85907f77b075. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/TCAJB2448168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed9e693314ac654d5f9065752145ce2a8ade93ccacea23aa040af2b2b606bb64. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAJB2448169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d0ce5dba01def538cc822d37cd7605f860c7a93509771c7e3abf430881de0ab. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/TCAJB2448172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce405aa79609c6c9e7ba5a82345c105cda512c51037b69e8d8b12b53877139ea. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAJB2448175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81c7b7f62b91c7cc6ab509e44beb3da3618a6c772a23334b02e9ed3cb25f26cf. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAJB2448179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29a37e2408acd53d87634ebcaa0033335ee4d57743f5173067f745a366f02a32. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAJB2448181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1bdfb2f0ab6c5a792dbb3dd67a3487551fca5f54cdfcf2967482855203e8117. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAJB2448186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x164b7c567e260d985d22972c6eb7a174a1889225bd8178da21cbd53b5e859bac. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAJB2448188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22373199dad276eeeaeda99b2c61e1a8ae2014150aa5de9f82696fbc5134bf64. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAJB2448190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a9f1260ad66ebd89aab5b8ad380e3a0f4c607a0a890fc0b80aaaa77fd039cd2. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAJC2448194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce841cdfde883ecb0557709caa3d37f4363e887af565f7d68787778ce0657604. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/TCAJB2448196.