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 0xaec72aab89a861135ded54d378d578d87748636a9a36ad7fee6cdeb5a27eb75b. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ebfcf3ed-2408-4fbd-9792-53b035463a76.json and https://artists.proofprofile.net/proofs/artist/ebfcf3ed-2408-4fbd-9792-53b035463a76.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
When I Survey the Wondrous Cross (Desc. George Guest)
Favourite Hymns from Oxford - Amazing Grace
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 0xde626f6c14a7340ad9ba9da40b7fcd6865939dd2628f63faaac03d1ce6adf166. 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/GBC7N1044706.
Miller / Arr. Rutter, Webbe: When I Survey the Wondrous Cross
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5639d0dff319fd415956e33bffe08bd6fbf27a60a91a838cc41549997b0c5eac. 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/GBAYC0002439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5639d0dff319fd415956e33bffe08bd6fbf27a60a91a838cc41549997b0c5eac. 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/GBAYC0002439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2972b0f634cd9d5c47e19f21b51bd9d6e8ed777d8fa8b4ac1fa72ea639ba5efd. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/GBF078540604.
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
Now the Green Blade Riseth: Choral Music for Easter
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5a5d2ee68b966e6e5234f6353114fdaf104e6707540dc1564c4bf12f08fa588. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/GBMY52206511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb816858a7968cdef039643cc7a5b01af74b24d4403763727848fa9b7d1405131. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GBLLH1957219.
When I Survey the Wondrous Cross (Arr. G. Shaw for Choir)
The Alpha Collection, Vol. 5: Choral Music from Liverpool Cathedral
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1d2a6d3d89704e5dd9fa1d51911d177e376f352b2a8bcec56adac465da61faf. 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/GBXUX0810413.
When I Survey the Wondrous Cross (Rockingham)
The English Hymn 3 – Hills of the North, Rejoice (Hymns for the Church Year)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6956ac87dbc80ba9e84ea58cd81cd37f19ef0153f7df60d92c0066a5025552c7. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/GBAJY0110312.
Praise My Soul: Favourite Hymns from Jesus College Cambridge
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x514e4b5552e4c82f8027134f373a40d61ce96c0642a1d3a22ddd613dd735daf0. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/GBLLH1854513.