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 0x27a5309a2f2f3b0aa798113d0091f794dd0b5b2cf211d249ca28d2b86116628f. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8eccf1e3-36db-4ff3-b24b-0a5d3e0200ed.json and https://artists.proofprofile.net/proofs/artist/8eccf1e3-36db-4ff3-b24b-0a5d3e0200ed.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Glass: Freezing (Arr. D'Angelo for Voice, Piano, Guitar and Bass)
Freezing (Arr. D'Angelo for Voice, Piano, Guitar and Bass)
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 0x684b3247d0b992c39025a766fccecac5a2ef715663353394565b08c34f4212ad. 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/DEN962434101 — a six-check JSON result.
O Love Is Teasing (Arr. D'Angelo & Helstroffer for Voice and Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7efc80daca7ea5500ff68be4bd17fd58e3754a856d997543a7ba6f9044fdebf2. 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/DEN962434102 — a six-check JSON result.
Quietly Waiting (Arr. D'Angelo & Helstroffer & Kramer for Voice and Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d5629495c84099e9b3663a3363186d1f17c3ef98f249bcd7e6ea53585d23ac3. 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/DEN962434103 — a six-check JSON result.
Wonder Boy (Arr. D'Angelo & Helstroffer for Voice and Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd90a6f88577afa8a12bfcaec7c7689028c531e751e2a9aab01d79f7bb0287774. 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/DEN962434105 — a six-check JSON result.
Lullabies: Snow (Arr. D'Angelo & Niederstadt for Voice, Piano and Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2709de60f23f1ffe8a738707635848bfa2dcc2213d53dad51c5a74381b5486e. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/DEN962434106 — a six-check JSON result.
Cold Blows the Wind (Arr. D'Angelo for Voice, Synth and Bass)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbefac816e518fcc2e72735bb7e416956c5b09658806c31fe9c916dcd957b742. 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/DEN962434107 — a six-check JSON result.
Lullabies: Silver (Arr. D'Angelo & Niederstadt for Voice, Piano and Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55b8b787688288419de27572d0f1be3fddc7f2e4ae2addc52dfb41ae4b37cab0. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/DEN962434108 — a six-check JSON result.
O Solitude My Sweetest Choice, Z. 406 (Arr. Helstroffer for Voice and Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad29b45231ecbb7870a387c755d7824d2a4f255a22ffbd7797da0c6c729e0c14. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/DEN962434109 — a six-check JSON result.
In Darkness Let Me Dwell (Arr. Helstroffer for Voice and Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafe50478e88784e3276804eb57834ba5f3a3a1631a967cb916b435cae48ab5e3. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/DEN962434110 — a six-check JSON result.
Grounded: Night Drive (Arr. D'Angelo for Voice, Piano, Guitar and Double Bass)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb21f0b815c68703ca5cecbcf67384dabca4e32867bdf6c7c14de5059ff8fa7. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DEN962434111 — a six-check JSON result.
Evening Song (Arr. D'Angelo & Muñoz for Voice and Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5517e4d161d51669ccaa506507f995f668d6e8714bb1f90303370d57ece79622. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/DEN962434112 — a six-check JSON result.
Morning Star (Transcr. Muñoz for Voice and Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90878be021c30cad0cfdcc99b07b309104a66d5082b7ad590a2d451e71ffedcb. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/DEN962434113 — a six-check JSON result.
Wandering Boy (Arr. Muñoz for Voice and Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x749710a2582d2be4f69213386284003deea52ce21d2809ad331255a9fa09e5b6. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/DEN962434114 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff3bd4669c5164257a0b072e53b5fade444d551931ec010c7c77f8e05d02f43. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/DEN962434115 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75318198a7e3bc1479ceb3c0486b2b23104c6ce8866d7e10948f4e6bcec3e4af. 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/DEN962434116 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14f01b7aec9e3d8fb78259adf11fddb2447e5232800db3b9b2e509cc16e20af7. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/DEN962434117 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3d7ddf9547232eb7d44a3ea726e26ecd9cbf9076ff4c90a50b4fbb2c548b42d. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/DEN962434118 — a six-check JSON result.
Tosti: Non t'amo più (Transcr. for Tenor and Piano)
Non t'amo più (Transcr. for Tenor and Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdcb56168498d087ce3a5c6f01d106e84879fe4953f45d8b579dbb6f9ad66433. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962401180 — a six-check JSON result.
Cardillo: Core ‘ngrato (Transcr. for Tenor, Piano and Harp)
Core ‘ngrato (Transcr. for Tenor, Piano and Harp)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde615d86c85623542859e17f4ce73352511e2e9366eda556ae14521a121be481. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962400910 — a six-check JSON result.
De Curtis: Torna a Surriento (Transcr. for Tenor, Piano and Harp)
Torna a Surriento (Transcr. for Tenor, Piano and Harp)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4dece14844f8b03b1df74982cd42f28f109b2950cb8b48911830793b0ade22. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962400870 — a six-check JSON result.
12 Etudes, Op. 25: No. 1 in A-Flat Major "Aeolian Harp"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b4d2d51267fba66e1643cdb9d2bbf10ddea0d0f4a6d2f8196d676d6479b6ac. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962000310 — a six-check JSON result.
6 Moments musicaux, D. 780: No. 3 in F Minor. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dad9852910586e7a2bd56511a6d1ff30058e5d799a9b1ef528ee4a700c75a44. 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/DEN961904290 — a six-check JSON result.
De Curtis: Tu ca nun chaigne (Transcr. for Tenor and Piano)
Tu ca nun chaigne (Transcr. for Tenor and Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9db622cbd1d3b8ce341da96099a567d76799f88207c92e54c8603443d52d0ad. 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/DEN962401190 — a six-check JSON result.
Rota: Parla più piano (Arr. Muñoz for Tenor, Piano and Harp)
Parla più piano (Arr. Muñoz for Tenor, Piano and Harp)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d409ae76f633ca54e4a5be22b7d35040d3261642dd9843479eee6efaaa19847. 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/DEN962401200 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd16f0f7d82c7d3932e349c24ae62363538c9eb5241e45d776e2688b0a76abc0. 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/DEN962401150 — a six-check JSON result.