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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44587bd49587ec34d188672f98ce4a5e61e64c383bbc49a6ffd39d119a8dba29. Chain 2 (Bitcoin): anchored in block 953860 (2026-06-15T23:55:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/02c74547-2fbb-4ce0-aeb7-452ae00b68ff.json and https://artists.proofprofile.net/proofs/artist/02c74547-2fbb-4ce0-aeb7-452ae00b68ff.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a4a5e6385568d7f379224177d7460a56bb5a894214625f1c84bb01adce84b52. 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/GBN3Q1901661.
The Oxford Book of Flexible Choral Songs
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb8b87c35755aa61abf2278a987e8fc93177aa017b9d867925847d0ef2e096ff. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBN3Q1901592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c892d07e590385d579e1db4e2f7e2ff2ab981f741dcada9a1c588bffb63915a. 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/GBN3Q1901595.
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.
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 0x05bdd77fa0239bfb7793402ef4233b14384d6bf00028e7c59eac0e5f3cfbd6f1. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBN3Q1901522.
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 0x7c297acee8f8bade68a00e0764d530dc1c2f8759f4ab5461a7ab9b1f922b2732. 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/GBN3Q1901545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x102e7b3d4beca8d8ebf9b7288d4e14b605d8367cb7bd8672d3b45f8d905f13eb. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBN3Q1901546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x975fb34419a01100e8dd14c68ba13822735daae85714cdf3c8d3336795a43452. 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/GBN3Q1901551.
The Oxford Book of Easy Flexible Anthems
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1624c3533fb8ec19914b53f5cc1e423f266267f5d6f07479c94429e59d18aa8d. 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/GBN3Q1601088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd603e5355a624d58f4ddd107cc4d5f9a542cefe5e2d48a36669d5d8869a298bb. 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/GBN3Q1601097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b45d8b377623eb9aa771b98e6440250d292e036cafb439650d14700148241f8. 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/GBN3Q1601093.
Spirit of God, unseen as the wind - Upper Voices
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4f6c542aa03fffa0b64d460cf67488c2f06a7d061a7b9cae06a8a03ace3c9d. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/GBN3Q1601094.
Come, Holy Spirit, Creator blest - SA, Men
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3fabcbde6d5de4abe0580c31e4d5c5694f7aeeadd6611883eb1ff7c3634b700. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBN3Q1601103.
Take up your cross, the Saviour said - SATB
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4477f58143389b9682e96a052f4c800c2859395a3dcef6c8761c5e8b50338cdd. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/GBN3Q1601108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65725b848626cf1e140626a71f69c2e8ffb8720e276917d829a12c1be302f656. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBN3Q1801470.