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 0x11024244686166954d62328b2a0dfa18fe4ced6db4f6b5fe508ea0909557d075. Chain 2 (Bitcoin): anchored in block 953588 (2026-06-14T04:52:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/021e3dc1-82ba-4a78-9e24-94d90f0c21c2.json and https://artists.proofprofile.net/proofs/artist/021e3dc1-82ba-4a78-9e24-94d90f0c21c2.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Antón García Abril: Canción Española de Concierto (Volumen 5)
Saints and Sinners - The Music of Medieval and Renaissance Europe
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 0x1a93e5fdd338551ceec6ee9260e3ff7728803aa1bcba643eafcee293cb2ee945. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199531217 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac69e0b5d52fc1af7f563265301d1b3fd4a58b4f2c63e3d2b8a1fec2b2b3c6f0. 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/HKI190008801 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x188ee2790b8cff06c118b7a1c1c87eb1c2cbec0a54efdb9b15e521af9b8fd87b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199530308 — a six-check JSON result.
Sederunt principes (4-part organum - plainchant)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34ccee54ce3aa819cacdac32fb9cb5ed9f5b09950a9fdc65758f383510ebb039. 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/HKI190433631 — a six-check JSON result.
Virtuoso Dance Music from the Time of Boccaccio's Decamerone: Saltarello No. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35564dd52977ca6105ce414edb7b254ccc8ef19b247a25257f52f4c3ad4f4d9a. 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/HKI199421209 — a six-check JSON result.
Laudario di Cortona: Venite a laudare (Come and praise)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b9237648a26b501c09db59d44701fcc02eac84ca3a033d064ce6a7dd1e32f3a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190556909 — a six-check JSON result.
Of Kings and Thrones - Classical Music of the Middle Ages
Cantiga 35: O que a Santa Maria (arr. J. Ferrero for chamber ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa17630681ff4dc45d44cd3fe65c1c77b967664949ea13429537b46b0c96769f5. 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/HKI191156101 — a six-check JSON result.
Dance of the forest of no return (13th century) (Stantipe II) (arr. J. Ferrero for chamber ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ff4038c204a057f74065fde862a890b0563c4451d4a569d199d03ef16ef7448. 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/HKI191156110 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7686fb01f7640678cab7e1be8966ec6229caa07a7d622932a58bdab00578e241. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199593503 — a six-check JSON result.
La ultime Estampie Royale (13th century) (arr. J. Ferrero for chamber ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd65cf76a6ee3a984faa2fa074394585efb3e68af0e9df5c4b777b682ffae21. 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/HKI191155912 — a six-check JSON result.
Adorna Thalamum [Erfurt, 1301] (arr. C. Haas for chamber ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x581e4859651f44296d4b5e98d237127ebe16c6a8c64ad1627b4f5a29c5a71ff2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191069801 — a six-check JSON result.
Serranilla: Songs with Guitar Accompaniment
La Vida Breve - Original Version / Act 1: " ¡Ah¡ ¡Ah! / ¡Ande La Tarea, Que Hay Que Trabajar!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x508a81f0399ee4e8e5014e8c7853d45cfc5f8017daf278afb01337c75730585f. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/ES5701400419 — a six-check JSON result.
La vida breve - original version / Act 1: "¡Mi Querer Es Como El Hierro!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34476df01567673a14fc7c0b8bab6c7183a817bae5b190a01b48b7b724067937. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/ES5701400420 — a six-check JSON result.
La Vida Breve - Original Version / Act 1: "Abuela, ¡No Viene!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ecae98a50f02da8e1b3bb4296e751508ee7facf3f17d395f86078e6134be7db. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/ES5701400421 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56b4974c31b7a3294ec8f8b464e8d8a316a166f7eb449a22ecff9fbdd3f42b75. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5701400423 — a six-check JSON result.
La vida breve - original version / Act 1: "¡Salud!", "¿Qué Pasa?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x587851d69923cde4c33a371b7b05e100e7127f3325fab702cf608f5c7cd374ad. 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/ES5701400424 — a six-check JSON result.
La vida breve - original version / Act 1: "¡Paco!" "¡Mi Chavala!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8aa8da5e2b2275138953606b1476567c26d301bed7a7a41128f4283f61ca728. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5701400425 — a six-check JSON result.
La vida breve - original version / Act 1: Interludio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d2b08eb7542995469722eda089fb77c68c8da8a9725f95af3e1d53f3c9b2378. 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/ES5701400426 — a six-check JSON result.
La vida breve - original version / Act 2: "¡Olé!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a1924cac278b1f6676c92c7fdf86b1b3a137ea5d6cc76e278742ca132612a72. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES5701400427 — a six-check JSON result.
La Vida Breve - Original Version / Act 2: "¡Allí Está!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe4c8febfa8c154ad76272f9e779e7b87571ff5072c6af1a976e51effc2e1154. 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/ES5701400428 — a six-check JSON result.
La vida breve - original version / Act 2: "¿No Te Dije?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc60e52022b07b02023abaff5ed0229b79e7539d1d462e38d5c170536b3a0ad37. 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/ES5701400429 — a six-check JSON result.
La vida breve - original version / Act 2: Danza
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3f24d3a12d8d25434f29dbaf37ad81dbf5cd34381942e78ceceba7897ff3c6d. 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/ES5701400430 — a six-check JSON result.
La vida breve - original version / Act 2: "¡Yo No Vengo A Cantar!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95739147831704e4a3c1f8a53243177820eb39d1f97f09bbe59f1752dd2e397a. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/ES5701400432 — a six-check JSON result.