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 0x6dd9d076f9d9e0e6b9bb4798c5dc1c0cb60c05bd728d39cfde6089c941e5d495. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2c82bd1c-676c-43a9-a6b9-a13ca2974fdc.json and https://artists.proofprofile.net/proofs/artist/2c82bd1c-676c-43a9-a6b9-a13ca2974fdc.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Dido & Aeneas, Act III, Z. 626: XI. Chorus "With Drooping Wings"
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 0x5ad9878ec0b1293558b8e8bdc015b7bcbb922624fea922d44958e69859a580a1. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FR50X0714039 — a six-check JSON result.
Requiem in D Minor, K. 626: I. Introitus "Requiem"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x069642cb6220d41a8aae839f91dd8056277746a3be7a293f8925fd095c2bb8e9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1017801 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf95b23a60bb00a6f5efc0d1f22d6ee2c2aadf0f02caf36fd8218d9f1f1fb415a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1017802 — a six-check JSON result.
Requiem in D Minor, K. 626: III. Sequenz "Dies Irae"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3262bbc660e95eabc2ad17d5ceea8867a0596331435187d4c8f3f35c923ccaf3. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1017803 — a six-check JSON result.
Requiem in D Minor, K. 626: III. Sequenz "Rex tremendae"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9f98fc61d9acb5a904726ae21926b84ad9e4ef0e81855730c7f370e1e9ebab9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1017805 — a six-check JSON result.
Requiem in D Minor, K. 626: III. Sequenz "Confutatis"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ac22047bb2ade7be9033e149462e3243c05e0c265d9ebbf1b5b040d57f83989. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1017807 — a six-check JSON result.
Requiem in D Minor, K. 626: III. Sequenz "Lacrimosa"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe80a8e46bfb899d604a0f71f6ca07c45319471111d9a026b608c7956e1abbab2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1017808 — a six-check JSON result.
Requiem in D Minor, K. 626: IV. Offertorium "Domine Jesu"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x132cacc2bc0fd66af85ba5805a651e0886e671f42ca56cd1738a88139dd31dcf. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1017809 — a six-check JSON result.
Requiem in D Minor, K. 626: IV. Offertorium "Hostias"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93183f54dfbcd87a7654938a4f89271bec5a583a8b3c8bfcf45507741dfe9f18. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/FR50X1017810 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf04e53ffa68227bdb0c7399477c34771f746761825501a88dda6cc3ef4403428. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/FR50X1017811 — a six-check JSON result.
Requiem in D Minor, K. 626: VI. Benedictus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b41fd5b32580abb273abc11c14d399a47ef9159522ecebf20726b97ea6dfcbc. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/FR50X1017812 — a six-check JSON result.
Requiem in D Minor, K. 626: VII. Agnus Dei
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2daa3baff64acaf6a78cee27f288bc3e84f1d48e089512318347c3b719905613. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1017813 — a six-check JSON result.
Requiem in D Minor, K. 626: VIII. Communio "Lux Aeterna"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18a523d3da3f923dc338bc28ed05ba3da77f7494f875bfa41c3e9ac9ef6b3a0a. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/FR50X1017814 — a six-check JSON result.
Dido & Aeneas, Act I, Z. 626: I. Shake the Cloud
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc264ac3c568be1c73bbce888125bd41bd4e458b74d0f91084f6f9a502fb5a2ce. 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/FR50X0714002 — a six-check JSON result.
Dido & Aeneas, Act I, Z. 626: III. Grief Increases
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ce8a5aebc15690ece24cf2ea6125737c9292077430ef7d0d9a1e259d86e7d3a. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/FR50X0714004 — a six-check JSON result.
Dido & Aeneas, Act I, Z. 626: VI. Chorus "Fear No Danger"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc4b4138396793da18c78b780f4332e4794e1a92868e0e90b39dc3462f33781c. 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/FR50X0714007 — a six-check JSON result.
Dido & Aeneas, Act I, Z. 626: VII. See, See
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb5c99892006f6d12bbb810bddb8cadb183f66e1b4a73efcfee216396104bb60. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/FR50X0714008 — a six-check JSON result.
Dido & Aeneas, Act I, Z. 626: VIII. Chorus "Cupid Only Throws"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf98ec280c460be097589bc2369a08092f8253129b0d9bdc49a32c3c5b3fa68. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/FR50X0714009 — a six-check JSON result.