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 0xcf8cf22fc80da0ffc0eba0b1699ce4308e0d1ed9614ce06765942ecd5b72e9fc. Chain 2 (Bitcoin): anchored in block 953733 (2026-06-15T03:12:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/969f8688-d23e-4daf-a5bb-212b51d788d1.json and https://artists.proofprofile.net/proofs/artist/969f8688-d23e-4daf-a5bb-212b51d788d1.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 0x5d01167139079b0a6d03b847b53aa8ef9ce35354aeeead10d5fa6b6d41120f24. 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/DET902175301.
Canzonette a tre voci (Excerpts Arr. for Tuba Trio): No. 1, Qual si può dir maggiore, SV 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41d4c4a14863fee6ad58efe46f5e26c9f46900d8ec1271074d51e23172ce2d39. 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/DET902175302.
Canzonette a tre voci (Excerpts Arr. for Tuba Trio): No. 4, Raggi, dov'è il mio bene?, SV 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78ba249f12a0b8eb904f7e3bebd46ca4da3d1d6af530bca95ccfe0ed38f08eb9. 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/DET902175303.
Canzonette a tre voci (Excerpts Arr. for Tuba Trio): No. 10, Quando sperai del mio servir mercede, SV 10
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6fc206db71f0bd20e130552fac001724c939f6c0b51c0ef2dde977633630ef7. 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/DET902175304.
Canzonette a tre voci (Excerpts Arr. for Tuba Trio): No. 3, La fiera vista, SV 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e2d7f93d2457e362ee00985879e98f0d9eb9f51b56b55a903aa048c2fb51a88. 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/DET902175305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d63cb75ae64d5bc5a1b329ea13b4f89cb5a0e935b6ee1fe638b58767d2db006. 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/DET902175306.
Violin Sonata in D Minor, Op. 5 No. 12 "La Folia" (Arr. for Tuba Trio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eb4811618968274cec063c29ef96c3c0bf68c86ba33c40efc2060137aa1f746. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/DET902175307.
2 Pieces for 3 Trombones (Arr. for Tuba Trio): No. 1, Felicity
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf08644a5826960447b740f7d0121179f2a91e2004b938f0aa55d615857c13339. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/DET902175308.
2 Pieces for 3 Trombones (Arr. for Tuba Trio): No. 2, Episode
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b953122a87ced44acc570e1142970a4de865cf383eaa692f79e51cf8770eff3. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DET902175309.
Romeo and Julia Variations (Version for Tuba Trio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c90db5d1689ec1fe009d8708fbab16b758185ac61430ce6397170e9f6a7073. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/DET902175310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b907897f6cfa3b70743bb04cb7144ce0d569ec96e56b3aa707d32e97abf106. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/DET902175311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9f1812e65a59f9795b98e85079ed52bdbc2b667518dffe585bf9400ee343e3a. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/DET902175312.
Moment for Morricone (Arr. for Tuba Trio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3902e04907a4f712acc609ddd29fbc94502930a26be61ef543df8a872fa3e01b. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DET902175313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58480d0c24b62fef781b81fbfe26020c1fdb6c8d048ac4e2a36b35c3a983af0e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DET902175314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa322f53bcc39816a7d221ba3d2167dba74a87ef0a4534c1f7406b585d0047fa3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DET902175315.
Von Freund zu Freund (Arr. for Tuba Trio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6138882f13781564e15b94a039ed975991826bb35de82dbeace6753502ec175. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/DET902175316.