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 0x61204aec00ab396d18b10000f4f21befbb69422450e7e277cb8faa4bfd25b169. Chain 2 (Bitcoin): anchored in block 953610 (2026-06-14T07:58:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/14c9fb58-9299-45f1-9aac-1f06c6e022dc.json and https://artists.proofprofile.net/proofs/artist/14c9fb58-9299-45f1-9aac-1f06c6e022dc.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 0x94d9674e4a95a937f37a0431b1877e5276107bc4c6518afcb71939a875c676fd. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/GBN3Q1501306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d0c1f782c3624f8c0c0ed16a039f3ff977cf324cd997e56d7b1feb850d24cd. 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/GBN3Q1701130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d53a1baf260bceab12c879a3454825d14494e6a600a55b33c27f4ec575a311a. 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/GBN3Q1301351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65725b848626cf1e140626a71f69c2e8ffb8720e276917d829a12c1be302f656. 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/GBN3Q1801470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fbd072f3b211bafe6c801e237cefd21ad07a0b44768a1de530b3b507e34de67. 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/GBN3Q1801258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe33df51db62bf97ec35934d2b2ca28cbf0de72216e23f269522ef4bffcfd4932. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBN3Q1301349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf77748a20b226d033a3a75ff2870fe9a15f2aa3e5d6fb0f843c34cce1972098. 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/GBN3Q1801467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1351cf0638e84eed58995143f65ec8b7065a228f12cae2b93131e03f29abfb4. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBN3Q1801474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40a8e2ec088a0e93104f5978310061a16438c9814f60060ee96b48e1c08cba10. 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/GBN3Q1501307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc820377fad9571cb723b4c5f6d1e6e4ef7b08569cef9122735a51ba60885146e. 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/GBN3Q1601285.
Requiem aeternam (from 'Sanctum') - Upper voices
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2155da8ab6a651c01c79c3235581b90a604d5ec695a37331d3013401fdb07d50. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBN3Q1601263.
Lux aeterna (from 'Sanctum') - Upper voices
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31fe4beb78116a4558176dab006bf8a8e85d520b1b7e97775553112e48b73f81. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBN3Q1601264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fdb0b732a4d15346e394f3a492ba7c85023e89e2f4668fb6e181b872b461067. 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/GBN3Q1801227.
Huron Carol (from 'An American Christmas') - SATB
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4ad7fa67ba343e854e1de5779e163f3929377a905cec1eec4c8f57198507594. 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/GBN3Q1701143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9ab8305addf24168ce5c41f5c06d02a3cae232e7b7d8f865f6f68baf21f548c. 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/GBN3Q1901537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x102e7b3d4beca8d8ebf9b7288d4e14b605d8367cb7bd8672d3b45f8d905f13eb. 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/GBN3Q1901546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94d9674e4a95a937f37a0431b1877e5276107bc4c6518afcb71939a875c676fd. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/GBN3Q1501306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d0c1f782c3624f8c0c0ed16a039f3ff977cf324cd997e56d7b1feb850d24cd. 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/GBN3Q1701130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c91fd81066546ecf5935ed6897b666543eb5fb49fc15a4ba1f913a021f2db59. 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/GBN3Q1901543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65725b848626cf1e140626a71f69c2e8ffb8720e276917d829a12c1be302f656. 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/GBN3Q1801470.
The Oxford Book of Flexible Choral Songs
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5434e7ae559543ccc70a074cf9dfa50f3970d50cdbfe0f0f1d3cf241c841477b. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/GBN3Q1901598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9fa2622984dabf7551b7df284d87a29ed4562074954ee54a9874dbb4e4e2743. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GBN3Q2202960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57b6f550a1d8e93d0778ee5cdfa76eb76acf29273d9c8746c1dba76b51a4c11a. 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/GBN3Q2101867.
Music for Mixed voices 2022 - Piano & unaccompanied
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01639bad3250dee404d1060e374b3fc731c1d265497acf0f7b04fe305612a02. 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/GBN3Q2202807.