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 0x54935ec0871dfc75771c150d182b17abeb4ebc4c2c928bd38075d8f90ff20298. Chain 2 (Bitcoin): anchored in block 953954 (2026-06-16T14:18:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/25258ae0-2b78-4c50-8c80-8f5888d023de.json and https://artists.proofprofile.net/proofs/artist/25258ae0-2b78-4c50-8c80-8f5888d023de.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Madrigals, Book I: Ch'ami la mia vita nel tuo bel nome
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 0xc40fbef0b308555cbefe2438d6c09babff3f7cd871fbbfcdc9175b96778f9ddd. 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/FRZ132304010.
Madrigals, Book I: Se per havervi, ohimè, donato il core
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ddaca9c92af9195e4b35adeb1057a53b44e72ead11ddadd9140bf0e6b863ff3. 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/FRZ132304020.
Madrigals, Book I: A che tòrmi il ben moi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8ab4d3a83a0a2b1dacec4b7000553072aced04a2193de9b7e97cae57c58f583. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/FRZ132304030.
Madrigals, Book I: Amor, per tua mercé, vattene a quella
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f73920ff9fb13f9b089b37f4a08e6b61f67835d7f564104d33fae173f6f12d1. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/FRZ132304040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd572477bb254bad8e338327dddc2127597a1db59072cbd9a585e3fda71d0eb. 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/FRZ132304050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc204d43a201163516844fd42c3b0a85337059d181529c2e49c3391ba2e32137c. 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/FRZ132304070.
Madrigals, Book IX: Zefiro torna e di soavi accenti
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6847c2c404c0e87a35553283b98fccd9c209baaa4be8dc3c05b1c60c0345df82. 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/FRZ132304230.
Carissimi: Jonas, Lauda Sion & Missa "Ut queant laxis"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbcd20abdbc4c78ee29d96120ff997c820d6cd307c549101782d9b013f19a9b5. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/ITJ090061021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6a24d1cbcbf7f284e0698ce9ff2abf582bda6bc9894fa55fd81c223349973e6. 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/FR10S1726561.
A. Scarlatti: Cantata per la notte di Natale - Corelli: Concerto grosso per la notte di Natale
Concerto grosso in G Minor, Op. 6 No. 8 "Fatto per la notte di Natale": III. Adagio - Allegro - Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9cfbe66d36222838c4ecb72ec002b469e72dd011f78a44174d9f457ed085429. 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/FRZ130883030.
Domenico Scarlatti: Stabat mater a dieci voci
Stabat Mater a dieci voci e basso continuo: I. Stabat Mater dolorosa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b2b1df3dcd657d2f587b8dc0ad44ac79672a046e1ee7d22b34269756b1ad40a. 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/FRX201659200.
Monteverdi: Combattimento di Tancredi e Clorinda & Il Ballo delle Ingrate
Il Combattimento di Tancredi e Clorinda: I. Tancredi, che Clorinda un homo stima (Testo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd84e54c26070ea17de05cce6d1bdacb8210aec98ab566fef215f1e12e01d6b23. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/FR2X41722264.
Note Femminili: Compositrici Lombarde dal XVII al XIX Secolo
Singing Christmas: Vocal Music for Christmas
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52dd4882a4aad059cc0f6a4201fe347e1e44aa0d0076890c80267951bbb3c0fb. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/FRZ149926010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f3bfe687158688fdf61ea39db904bc13e5c6ef6ed64d595700f40a18530a81e. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/FRZ149926020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d01bc93da711004f7473962c63ff504c59b33e133428757784f7424edf2316f. 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/FRZ149926030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7ac0b79bf89df61b307b49f274e8e300e39c1603459e1f541aaa7b9f3bd30c6. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ149926050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb18fd3d0b0da58b4714bc01b090c22f3c1d0107f85ebbb971c7c2406fefac02. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/FRZ149926070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa102ed663d87ac4ef7cf271e83e71c38fcfcd23132a23068db617dd6edd31d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FRZ149926080.
Almisonis Melos: Latin Motets and Mass Fragments in the Ivrea Codex
Vos qui admiramini - Gratissima virginis species
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd7214d4f7f15275f28b77c65430497cd1b87809661fa7a445e3391c4e6b0ba7. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/FRZ130856010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa515a44810b730754318fc643523c82ce86136b1531a542bcafd74172a64bc79. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/FRZ130856030.
Eccles, J.: Mad Lover (The) / Bononcini, G.: Barbara Ninfa in Grata / Barsanti, F.: Overture, Op. 4, No. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69696259690b155f5fb3b1ef4f1c58e10f8d697f3542d07e25864752c175db6d. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/ITN320812002.
Carissimi: Historia di Jephte, Damnatorum