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 0x2f2a08fd40d91ea99c722986a8e7b798dcaf32bc28f808e34bd8171d8c4e0264. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/49b4f0ba-5cc5-4d14-bad6-d3ec378090a8.json and https://artists.proofprofile.net/proofs/artist/49b4f0ba-5cc5-4d14-bad6-d3ec378090a8.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
MONTEVERDI: Madrigali Erotici e Spirituale
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 0x0acf07e4969adcbce49b2b1e3e68754a9a9b0a175a4977cf8cc47ccf4992b330. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX761216001 — a six-check JSON result.
Madrigali Erotici E Spirituali: Quel Augellin Che Canta
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8413e4514327a635a27b0a10199c7fdec09ec50af34b6d9a64c8fffe5db49f2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLN580507582 — a six-check JSON result.
Looking for Europe (The Neofolk Compendium)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3b2e716e4eaeb3ed071e65a1cbda158da24745a151379518284ba82c32a8dcc. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES561599828 — a six-check JSON result.
Cor mio, deh, non languire: 21 Settings on Guarini's Madrigal (c. 1597 - c. 1700)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56b843adceac677562e178b7158abe7f3facc5efd01d67c300e61c15c494caad. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7141500585 — a six-check JSON result.
Madrigali Erotici E Spirituali: Qui Laudes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55431f3745b4835f18f1f523d4c05f1eab3222143a2b4fef0d2b272ba79c7ca1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLN580507583 — a six-check JSON result.
Madrigali Erotici E Spirituali: Sfogava Con Le Stelle
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x940c52598c017fde4bdcec0c4c6f8b4550599fc08de667c74e92a0ea9cda3d54. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLN580507584 — a six-check JSON result.
Madrigali Erotici E Spirituali: O Stellae
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a9c06a90805239325eaa159d4982c065288c895e1fc5b5ee77004ddd9045947. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLN580507585 — a six-check JSON result.
Madrigali Erotici E Spirituali: Plorat Amare
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36acb091ec6a4e05a069df2b1d4e67989bf224c1900ac732c991301546d22aa2. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLN580507592 — a six-check JSON result.