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 0x8ec5714f1f3190c0d936434e955393c327525f64e7dc0128b2769ee5e69480d3. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4cf71020-855b-40d4-b806-3a26ff5dcb14.json and https://artists.proofprofile.net/proofs/artist/4cf71020-855b-40d4-b806-3a26ff5dcb14.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Guide me, O thou great redeemer (Cwm Rhondda)
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 0x44dbce38247af631701af2b907d361bc7bfcbc07fd9471ade2703351d24a5d09. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9102601 — a six-check JSON result.
Handel: Judas Maccabaeus, HWV 63, Act 3: Chorus. "Thine be the glory"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4536eb7dc758e49c99b9a9db5f348f658483ce6c2c2a631530d32809c4a83749. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9102609 — a six-check JSON result.
Mine eyes have seen the glory of the coming of the Lord (Battle Hymn)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa372f1e64cb94018128b0f1cef956b55fbaa31e969abdb13eeb11a2634d563d0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9102597 — a six-check JSON result.
Lead us, heavenly Father, lead us (Mannheim)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0b0baaca2507a8a01f9580294322a78d1733df41b3d4dc15dd8079e7db912f9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9102612 — a six-check JSON result.
On a hill far away stood an old rugged cross (The Old Rugged Cross)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa68340df9973dda3e35e28cb36a7b3fa1359ee04b06698521fcf72da68f2df4. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9102600 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01c48ae748216cf1e07699aaeb6d229ff37580ba4fc3e573363a3802ba2a4a3. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9102602 — a six-check JSON result.
O come and mourn with me awhile (St Cross)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f5334abcfbdbc498db4b71bde53ab0c6372039bc8eeade0af2e2de1781b8b4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9102608 — a six-check JSON result.
Love divine, all loves excelling (Blaenwern)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdba2e4c67bc27b1b14c213e939aaa1f91a6a5c35bef6b3bbbc6ff9d75cc1e69b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9102611 — a six-check JSON result.
Onward, Christian soldiers! (St Gertrude) (brass & perc. arr. Tracey)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2032f145903dfc390bbcfaf46ecf139bf829d67a6c346520e9699dde5ba1af6b. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9102613 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa372f1e64cb94018128b0f1cef956b55fbaa31e969abdb13eeb11a2634d563d0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9102597 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa68340df9973dda3e35e28cb36a7b3fa1359ee04b06698521fcf72da68f2df4. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9102600 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01c48ae748216cf1e07699aaeb6d229ff37580ba4fc3e573363a3802ba2a4a3. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9102602 — a six-check JSON result.