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 0xcf02f9c8bbe7aec03e785f46a30570c73b8cf36eff7dbe9b02dabd9faa36205e. 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/4c8da084-03fc-4dc9-8ce1-025fd7597726.json and https://artists.proofprofile.net/proofs/artist/4c8da084-03fc-4dc9-8ce1-025fd7597726.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xc3db240fb5b57a0e8e7269d90d535a5c173dde3b7890e3befd2e4c9f043d85d3. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/US7859410688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8076a4955e69f9b1e7a608cfe05f02d454f67fb17616386edbdbc4341e194d8b. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/US7859410683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3db240fb5b57a0e8e7269d90d535a5c173dde3b7890e3befd2e4c9f043d85d3. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/US7859410688.
Catholic Classics, Vol. 9: Catholic Spanish Classics
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5113492cb36eb9f3f4b5ddd1634f112d747348077659f00c82370a1edee2fe88. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/US7850810319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a1adf4d09fcfe30d93c3696611c4d75b47c61a8570b40a79b2e9059aefd3be5. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US7850810320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x270bd54f0e7440d1b747419d64dfeddb218bdaaaf667039d15cb153c80a53349. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/US7850810321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x660bd3516f69445790ebd703e56c5046e85c441b92292c88d3a9cd8c3ea0b8d4. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/US7850810322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x575ac9578e6c04e43cd30c9dbb6f54e16644a2706edc63a6413c685896b978fe. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/US7850810323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24adc6b2f3f75ae1786d053fb0b049d2a82979cf188ff42dd63014682ebd0812. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/US7850810326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x335b8efe05244433e013905af2a6f3406c20b203fa5454bc64a22b64607e1ba1. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/US7850810327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa62fcefc05fb941bd0fd705187fd425fbd1aad4319c08815c8feafb74cb0c57c. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/US7850810328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc881be919d543bf1c8b6362070bee4bb817408526dbc4a02e8eff6de638ef4ab. Chain 2 (Bitcoin): anchored in block 957558 (2026-07-11T11:36:38Z), 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/US7850810330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc5323df3582b4a59e8c3e023efa31ad37815c00fe13bd5bc2d651c43695478a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/US7850810331.
Catholic Classics, Vol. 9: Songs in Spanish
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7fdb9cf195183bc1fca103a4f308081959e698ae9dcdf79ee04cabaffa80693. 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/USA4N0600432.
Benilde-St. Margaret's High School Choir
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb2b501a2f2e344bf05ccf770eb558d115a00f9a8f9b2615c1454e60b12833d6. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/US7859910802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7cad35b22607a245af935b8da95e7370f57355c53e75c514cc704438a2f7a17. 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/USA4N1200505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x241388f6d085ac8f791cdd9513d34d16f9621c5df89bfe29d2dd8bc777be7528. 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/USA4N1200504.
Salmo 62: Mi Alma Está Sedienta de Ti/Psalm 63: My Soul Is Thirsting For You
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f250b90c6370d66eee32a473e2e10d89a3a8d5b7d1dae9912d4c7e4bc00d99d. 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/USA4N1200642.
Salmo 41/42: Como Busca la Cierva/Psalm 42/43: Like a Deer
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5fdb86fb9424e30b7e98e74c4443ff03f0d66c5b2a76de1e6e1803a571a4eff. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/USA4N1200650.