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 0x1aacdc2f616e25fcffa84c327b80a0ec719b6f30445c3974c69562d64e10cfd0. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e7114c03-fe47-4cf0-ac85-c029fd4ebd93.json and https://artists.proofprofile.net/proofs/artist/e7114c03-fe47-4cf0-ac85-c029fd4ebd93.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Leyriath, of Music and Legends: Cantigas de Santa Maria (Alfonso X)
CSM 18: Por Nos De Dulta Tirar (Nunium, The Wizard Of Leyriath)
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 0x0cb01f5dfdd379581cc1ae3e76a1d8feb9b498c21d024782bf2c31312b58a56f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6N2124912.
CSM 400: Pero Cantigas De Loor (Journey Through Liz And Lena)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52390abcff944fed7eb5d0329ed190e95e572f7d2b8894868e1e1b4bfa8f2ef3. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6N2124913.
CSM 37: Miragres Fremosos Faz Por Nos (Chasing A Dream)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fe7c0499ff5f78f6b97a97228ff8390098e3a26f0ecebaeacf674888f3b462a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6N2124914.
CSM 340: Virgen Madre Groriosa (The Muse And The Bard)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81f2011b5d88deadcd4c20e3848e5ef4dc50a7eb09b3334f4e9d86389548b7b9. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6N2124915.
CSM 380: Sen Calar Nen Tardar (Time Of Sharing)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdb82360fa423c258f94287ecc4a6be92d3f6eec3e6014d4b75ed7680ef110ba. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6N2124916.
CSM 163: Pode Por Santa Maria O Mao Perdela Fala (The Quest Of Nunium)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e60f175c92ed20a1e787011e40f7e853e3c9e8c5e3a123ffe2fb067d4bf3040. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6N2124917.
CSM 126: De Toda Chaga Ben Pode Guarir (Yearned Encounter)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa71d7e580420c9cab25d9fc6a396987f5fb59b4751d769fb6fec1c1053a1dd85. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6N2124918.
CSM 123: De Santa Maria Sinal Qual Xe Quer (Everlasting Promise)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf780b0461c54f179da903c4832159581c59dba27946dfeab785d186702bd28d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6N2124919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x856faae80f0f505598d6f523f60d36660e858e57d30e16d12efca36aeea947ff. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/QZK6N2124920.
Prince Henry And The Earthly Delights (If Love Now Reigned)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f7390502f0991e7780f55250c24c2c9559ae60b7de234bf7d7b5d49f0ce8793. 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/QZFZ52143388.
Catherine Of Aragon, Divorced (Pastime With Good Company)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x557a6b408fcb4199563310bbca7d77f5e9fe365393cbea8ea521b8cec844dd9b. 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/QZFZ52143389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7a2dd0f8b0da01aecd8b41236a9cb3df4b24d18301d75d36cf629c22b4ee9b1. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ52143390.
Jane Seymour, Died (Whereto Should I Express)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3f6567c4aa89d89346cd85871c51a0c5346c84d77b028b7a9a8158467fddafa. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZFZ52143391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca6692c7824a42e544434bbe0b2c79b60ff665d1dcbb11889e30488b0a52feba. 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/QZFZ52143392.
Catherine Howard, Beheaded (Helas Madame)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe05bdd7d3543f366b8a85ebfff986e3795623dd17d2423e2ffad1ff2c9c32300. 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/QZFZ52143393.
Catherine Parr, Survived (Though Some Say That Youth Ruleth Me)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce5865c9c9f8c03801278e6bc7704dafe8f6994284fd85b5095b90c6c1363103. 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/QZFZ52143394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c62499c7671b1b337963f06bacecb97ac9ebc80d06999318d7a2a0f130f156b. 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/QZFZ52143395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff7a459889c3605734f20933b9a9e4f5300ace2b71e2c29d5d3cf7b554ec7bbb. 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/QZFZ52134829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09978d4d8664ab354f6e06b185e833cc000d079752e9b26e726c0204d372daac. 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/QZFZ52134833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bb4c7c8ec7e15ef8acfc94d6527d9ac717e9d8b96670e27f52207e7c7c13527. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZFZ52143396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28c25313317ec9ba6512a5c31cf6f50a16530c11991a066e4366030ab4ff694f. 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/QZFZ52133331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11741710e4978b25e5a38e5b4e8f6677ec9c787c47fc1a5e1fc34fd1f2c51f46. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ52134836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52c128db0d820834a874dfd927a6e2b2027722f0bac5118d9b41dbac3c1e2bc6. 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/QZFZ52143397.