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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d72d9f603149429c5fb0582db9f1a32eaa7cac16080c2f0ce89b94a342b980e. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ff705f5d-ca19-4320-b1c0-77140610e525.json and https://artists.proofprofile.net/proofs/artist/ff705f5d-ca19-4320-b1c0-77140610e525.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Concerto grosso no.1 (1976-77): 1. Preludio: Andante
Schnittke: Concerto grosso No.1; Quasi una sonata; Moz-Art à la Haydn
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x724ca0ad4b626a04a56e1680ee0d8dfb09651d3db75e921b5915bee7c1f4e079. 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/DEF058803641.
Concerto grosso no.1 (1976-77): 2. Toccata: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5a55e71a9f7d5ed0843fc30e0e4c5f678e4f931d4ec2e4b2000a25d881f382. 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/DEF058803642.
Concerto grosso no.1 (1976-77): 5. Rondo: Agitato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x635576cbf83e43f01152ca8aa9420cd2ce6fce311c6412db815f7827bd335b79. 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/DEF058803645.
Concerto grosso no.1 (1976-77): 3. Recitativo: Lento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd09d07ec7be9e504a02f5674c55b3638e88fe422c3239e7ee19fd9ada756f486. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DEF058803643.
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
Concerto grosso no.1 (1976-77): 4. Cadenza (without tempo marking)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ef1a03862c9a07743d3e95470916484983a03fa4be28e1c4eb722f4ce5b0f18. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/DEF058803644.
Concerto grosso no.1 (1976-77): 6. Postludio: Andante - Allegro - Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a4371e7d32823e6e5e530449ba3fb0fa7a6119e809a525fc0ef1e1ca26bf58b. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/DEF058803646.
Quasi una sonata (1987) For Violin And Chamber Orchestra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a8ad401691f6c0be1480c4582adbf51ab4062a74f616c4416f87726961f96ae. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/DEF058803650.