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 0x2192409d8ee7ea140b7ebc6ab0851c6989563f5e1731e91ed7783a966cf0e9af. Chain 2 (Bitcoin): anchored in block 953903 (2026-06-16T07:05:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/14df95fa-9722-4aa7-9f91-8229e558e571.json and https://artists.proofprofile.net/proofs/artist/14df95fa-9722-4aa7-9f91-8229e558e571.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Greensleeves to a Ground (Division on "Greensleeves")
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 0x996d783f2f6aef7a6a168f79fab93cbc7522ab454315d405bb84c01dd85d2325. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEBI81946001 — a six-check JSON result.
Instrucción de Música Sobre la Guitarra Española, Book 2: Canarios
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c221a3112839afd5d75d1941be8d37f6e3fa7b7763b1fb2466914c938a1d9dc. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA291800017 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe644538e54975c0a365b9859675c74169172c7e5347a2487ee0fa8e706532c2e. 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/FR9W12020496 — a six-check JSON result.
Les Baricades Mistérieuses (Arr. Daniel Zapico)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb781b22002198f396156aaf0c5a994c209c87611bab3b71c7f9bd1e97e73daf. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR9W12020497 — a six-check JSON result.
Assez de pleurs (Arr. Daniel Zapico d'après Robert de Visée)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a8dd347b40deb63e9fd24f34d0aac538417e20d35774ddae582182cfda4c863. 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/FR9W12020498 — a six-check JSON result.
Ma Bergère est tendre et fidelle (Arr. Daniel Zapico)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc00de0f3456c6e760c090a7cf69883ae604ccb196fc07891c4afc209c784d8b5. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR9W12020499 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf54026ae21fdb09ffe104583eb8b3881db80e910010db6b3f4f65713b739637. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR9W12020500 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7100975bac27f7084c2f56aaab4bbb2ad70d68a144c3f757c2638708af111812. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR9W12020501 — a six-check JSON result.
Vos mépris chaque jour (Arr. Daniel Zapico)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2872ab017adbbabe55731feb2f09eb7523627bbdea2f861990c3c78d2c530f4. 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/FR9W12020502 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2282aa1849b60957e5399ecf33613fb1b279f23d194697a2deaa398dcdfa377b. 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/FR9W12020503 — a six-check JSON result.
Le Carillon de Passy (Arr. Daniel Zapico)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0849a34963d4fa44792f32aa7fe48fe372f6900a6639e93346a060adeaf3b311. 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/FR9W12020504 — a six-check JSON result.
Les Silvains (Arr. Daniel Zapico d'après Robert de Visée)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b8e64bdd0bc75f1ef98dc5bc21fde381b8b65b8d258efb1c2075ebf90a141e5. 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/FR9W12020505 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13c88f449ec4e6421cfde0d29011140c92c8374b255cd64ec6be923f3ac08d2b. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR9W12020506 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc6334183faebb258298d76117faf77733adf5049c2172e617161740d532c10e. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR9W12020507 — a six-check JSON result.
Bouréé / Une jeune fillette (Arr. Daniel Zapico)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1260214eba2fd0768924a66bdee0e661d93d27c8a976bb49155d151bcaa0d3ed. 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/FR9W12020508 — a six-check JSON result.
Plainte sur la mort de Monsieur Lambert "O mort, affreuse mort!" (Arr. Daniel Zapico)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd607a80599a2cb80e91fc05fee8cefe56f503ed6f1d85f66799adeb9b302341f. 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/FR9W12020509 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23cb569ac5688137111ca482feefa2ef9df3b0146c3c911fbb796856af11b305. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR9W12020510 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1845c53eaffe47f906f788b9b83ea6de188e2f8cce42cfec0bf896734341cfeb. 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/DEA292000001 — a six-check JSON result.
Sopra Scarlatti (Cantate à voce sola di soprano di Domenico Scarlatti 1685 - 1757)