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 0x0a7fd8ec4c59dd979f7619c8287999fbf2c9aa6daf06f20668d55508af949492. Chain 2 (Bitcoin): anchored in block 954623 (2026-06-20T23:40:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cb03c239-77bb-47b6-948e-12f56c58084d.json and https://artists.proofprofile.net/proofs/artist/cb03c239-77bb-47b6-948e-12f56c58084d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Wolf, H.: 6 Geistliche Lieder / Reger, M.: 8 Geistliche Gesänge / Webern, A.: Entflieht Auf Leichten Kahnen
Choral Arrangements - Berlioz, H. / Ravel, M. / Debussy, C. / Liszt, F. / Wolf, H. / Berg, A. / Webern, A.
Haydn, M.: Requiem in B-Flat Major / Mozart, W.A.: God Is Our Refuge / Misericordias Domini
Wolfgang Rihm: Passionstexte No. 1-7 (Kammerchor Saarbrücken: Ultimum)
Ko Matsushita: Consolatio. Contemporary Choral Music
Requiem in B-Flat Major, MH 838: I. Requiem aeternam
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 0x2545bd78ec2d8e9e5789cee7f24153942628d89de6326a3314d962b1bf39c2d0. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB110601101 — a six-check JSON result.
Requiem in B-Flat Major, MH 838: II. Kyrie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8048fa665ab5a894d8b99f18936a2419a723fca8ebf8d5999bae1a1004b00bb. 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/DEB110601102 — a six-check JSON result.
Requiem in B-Flat Major, MH 838: III. Dies irae
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd628b13ac5b612498dd194eca4ba8bb047e717327a7ae3b5df351e5546ba396d. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/DEB110601103 — a six-check JSON result.
Requiem in B-Flat Major, MH 838: IV. Liber scriptus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc973e66cdae9dca0b6d5e1edfcf89aa1c60d04783f9cf6f91a447bd7b874a74f. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB110601104 — a six-check JSON result.
Requiem in B-Flat Major, MH 838: V. Rex tremendae
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80b71968c43f13efc6795ffb523468e42f20fde17e00d6edd665526bed95f1e5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB110601105 — a six-check JSON result.
Requiem in B-Flat Major, MH 838: VI. Recordare
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb992ef9adc10dc45ef6e465c69ec95bd365767b905f5bb149c97e5852a4d369. 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/DEB110601106 — a six-check JSON result.
Requiem in B-Flat Major, MH 838: VII. Confutatis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebb0bc8501872f825b44eb248bc9d401a767fb3f0f1b9d5d015270226729ee9c. 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/DEB110601107 — a six-check JSON result.
Requiem in B-Flat Major, MH 838: VIII. Lacrimosa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08c2decdff004792fa9e1b4356695e0def8c17615159f89b1d4eacad3670a91c. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DEB110601108 — a six-check JSON result.
Requiem in B-Flat Major, MH 838: IX. Domine Jesu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcecf38d154879afdaca43af9cecdc3e4344232ecfec12190af77cb5f9e29d46e. 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/DEB110601109 — a six-check JSON result.
Requiem in B-Flat Major, MH 838: X. Hostias et preces
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08c47d3c3124ba33e98751ec09b0454112a18f60de90d9d54e7d13a98973120c. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB110601110 — a six-check JSON result.
Requiem in B-Flat Major, MH 838: XI. Sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x407f8b545a87b566818bfb1bcb529a5157b7f5bac963837d55033d182933c23f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB110601111 — a six-check JSON result.
Requiem in B-Flat Major, MH 838: XII. Benedictus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x941937bb7498f3fc49985e13c85ae46da824102a5dd5f3f96c92c00a4869bf2c. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/DEB110601112 — a six-check JSON result.
Requiem in B-Flat Major, MH 838: XIII. Agnus Dei
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39f20efc0c8388f249e2fa44a8b87630bc6444bb2b5e392d2b5972a3ffacb0fe. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB110601113 — a six-check JSON result.
Requiem in B-Flat Major, MH 838: XIV. Lux aeterna
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa325723635c41ccd02f82f535f2194d2d272ab3a875124aa8d41608454783de. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DEB110601114 — a six-check JSON result.
Requiem in B-Flat Major, MH 838: XV. Cum Sanctis tuis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1d1575269d6414cc254255d31c535ecffc6b00dd82fefda3c138585aafa8a35. 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/DEB110601115 — a six-check JSON result.