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 0x3d5bc06299186be80e641a90e51f18df1bfc2af52126b197f9c82da2c91759d9. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3c6fd99f-7281-4215-b3a3-1cb233d766d3.json and https://artists.proofprofile.net/proofs/artist/3c6fd99f-7281-4215-b3a3-1cb233d766d3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Christmas at St George's Chapel, Windsor
The Choir of St George's Chapel, Windsor Castle
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 0xba0688e3491329af026b050e9d79dfdd463522a4d46cfb00ffb86bd09b91501d. 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/GBAJY1928101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e2484a2c1190ae86686fe959e8a104e8b35ef27e1ead21abc66be332ccecab3. 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/GBAJY1928109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21a3014838035c1ee1209a7435566207edfd6a103d90bc83cb31670c3abf6135. 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/GBAJY1928114.
The Chapel Choir of Pembroke College, Cambridge
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a37e519c074ba198b2306cc105fcfab54e1a640daed15f7f3937e051264ede2. 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/GBLLH2064209.
Now the Green Blade Riseth: Choral Music for Easter
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c7d1930e1971e141692553c04efa7604ca53da6eb43b6d4d8e99ab01066a6ea. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/GBMY52206509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc7cc2b938f8c3a1871c8987f7df17ab9b439f9fa479f4d03458736dc739fa78. 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/GBMY52206505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaef72ca33d2b9f3a0a622f336ed52be211175e535906b9092921006cf66c41d9. 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/GBMY52206513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04fe18823c6a0a5b0ab0efd0e1323d012253c32df15379934ff5d8f294b77fa. 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/GBMY52206501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d335d3db076b2ea5ddb80c815ba47862ae05be5b0a56018b9ef035360c21fd2. 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/GBMY52206517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfda088d252154ca670fb882f98b490af12fd0a7e2db9dd5e8f47e391d2c69db. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:21:46Z), 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/GBMY52206508.
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 0x8263355361f748f7596f89d07bf39ed8ad5419df66db8d79ced811ffb639d4ec. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/GBMY52206514.
Choral Improvisation sur le 'Victimae Paschali' (Transc. Maurice Duruflé)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a00e312c55e77ce19daa7eee839e655eee988870f13362507162866beffb741. 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/GBMY52206518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71585efa25985e949a33a28fd26fe7d616709a3b2da1c984d3c215f6a2ff0601. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GBEJP2118804.
Now the Green Blade Riseth (Arr. Bob Chilcott)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb68261d4b6fd364c9cae9786c19ee6f0c26f8a58d7b6501996d7378499aef04. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/GBMY52206512.
The Light of Life, Op. 29: Light of the World
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeeeb1b25a79084cf8ce43db34ee4a8d0b80f86136e96962fff5de097ef74a63. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBMY52206516.