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 0x3896f7344cc286e3106108a980f4d58061822f988ef94616091aff63c9f470d8. Chain 2 (Bitcoin): anchored in block 953699 (2026-06-14T22:00:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/54c8170f-b046-46d0-b593-47bb6e2aa6c5.json and https://artists.proofprofile.net/proofs/artist/54c8170f-b046-46d0-b593-47bb6e2aa6c5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x556954e8880f1c1975e7e1efaa60b9d08f4bfe615c2533432ac1e158111014fc. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/GBMY51702405.
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
Requiem, Op. 48, N. 97: Introit (Ed. Marc Rigaudière)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0519ec448c76d65c3d352b6adfe49b3136db515cbdbb555b62583af6098629c7. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/GBMY51400501.
Requiem, Op. 48, N. 97: Kyrie (Ed. Marc Rigaudière)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf3574446e798d6eef9084ab8021bddb0f5eec7bc00a2d2b222caeb651653660. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/GBMY51400502.
Requiem, Op. 48, N. 97: Offertoire (Ed. Marc Rigaudière)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5fd40124ca1aaa5443ad570fdbd45176d82dae9639a5afc4fd282be8cd17947. 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/GBMY51400503.
Requiem, Op. 48, N. 97: Sanctus (Ed. Marc Rigaudière)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b7c140059505a201d6e562a9cab7b58733d6ca066d832291526bf61240b664. 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/GBMY51400504.
Requiem, Op. 48, N. 97: Pie Jesu (Ed. Marc Rigaudière)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fe3576e9e1f8df5a5e7f996b3335617bdac94eb018e0fec0f84d9bc031933ad. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBMY51400505.
Requiem, Op. 48, N. 97: Agnus Dei (Ed. Marc Rigaudière)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x605fa22a742583dfbec2cb34a4c63f670565d5d7acec1088a70663ca6c0651c2. 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/GBMY51400506.
Requiem, Op. 48, N. 97: Libera Me (Ed. Marc Rigaudière)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb699c7e2d42f6361da258c1b1cabdb408c6d723b5119bb029f6ee4407b255021. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/GBMY51400507.
Requiem, Op. 48, N. 97: In Paradisum (Ed. Marc Rigaudière)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde4aedf6bb8df45c085abd723ddf6ec81a679eb11ff88e92db214e53b62ddb35. 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/GBMY51400508.
Requiem, Op. 48, N. 97: Offertoire (Ed. John Rutter)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c2b07c3cf90a828f846ca62002231a99ff43413c334f1dc50a718a5ac29524. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/GBMY51400509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45dabf21dfc571d0e364622ebd6c93bff0db570c1b344fdfe636859fde02d42c. 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/GBMY51400510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0122c32f2797ff985ccf9bfb30c5620209e9a267e71aa82cc9032d4a24c7bf4. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/GBMY51400511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd60dd0fcac271d24c985d8833dd9bd273ae26b3d2efa4b9ff342bc8e16b052f3. 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/GBMY51400512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52c88bfcee38852a1cba85f0108d824666f4fee131743ae243289bb5946825a3. 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/GBMY51400513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6fc22d9fcc0c9e42e90ce7cd879a93ca279ed10a12cd2b9b6dec3f8c73b6585. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/GBMY51400514.