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 0xc490ad59ac8f872f9c0be78a8ea41aca8932f42ef1e89948fad1645a9bce8f92. Chain 2 (Bitcoin): anchored in block 954717 (2026-06-21T15:47:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f31cc951-0558-490f-8fe9-591078f14dde.json and https://artists.proofprofile.net/proofs/artist/f31cc951-0558-490f-8fe9-591078f14dde.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Requiem in D Minor, K. 626 (Completed by F.X. Süssmayr): Introit: Requiem aeternam (Chorus)
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 0xbb9c7add78b001a22a13592d4a6fb742f881a531557103f8476e1c13f33c4da0. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-22T01:13:20Z), 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/PLA161521001.
Requiem in D Minor, K. 626 (Completed by F.X. Süssmayr): Kyrie eleison (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3b79c0ea918ecef3c2417ca62adda29a523acc41949a73bd791de572035827a. 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/PLA161521002.
Requiem in D Minor, K. 626 (Completed by F.X. Süssmayr): Sequence No. 3: Rex tremendae majestatis (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ea7bcee5ee89e6f027a9f5cff3253f8fd9004281eaf029c17c97b8f493b0cce. 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/PLA161521005.
Requiem in D Minor, K. 626 (Completed by F.X. Süssmayr): Sequence No. 4: Recordare, Jesu pie (Soprano, Mezzo-soprano, Tenor, Baritone)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fbee82afddc75417e7382caae65d1c4cfe5c471871efbc83d197b55e84d9e03. 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/PLA161521006.
Requiem in D Minor, K. 626 (Completed by F.X. Süssmayr): Agnus Dei (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3275ab185163c487619e4ae7b37ae5b44197f96058e8f069fdc87c8d576ec07c. 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/PLA161521013.
Requiem in D Minor, K. 626 (Completed by F.X. Süssmayr): Communion: Lux aeterna (Soprano, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92c0b21376f3fe43ee99119f295d6d00bfe81a6f71191ad2c42d283bbefcdab. 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/PLA161521014.
Requiem in D Minor, K. 626 (Completed by F.X. Süssmayr): Sequence No. 1: Dies Irae (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67fd3fc809c292f7399e9c82a1d58c3a58d1515ab08961f5613dcc477832e943. 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/PLA161521003.
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 in D Minor, K. 626 (Completed by F.X. Süssmayr): Sequence No. 2: Tuba mirum (Soprano, Mezzo-soprano, Tenor, Baritone)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dd678d3bdfd98a71b529c36fc713694158d976580a840026992cab90fc141a3. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/PLA161521004.
Requiem in D Minor, K. 626 (Completed by F.X. Süssmayr): Sequence No. 5: Confutatis maledictis (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2385c22636b9665199dc7853880991236a19c105e6df508b9226ed1a013589a5. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/PLA161521007.
Requiem in D Minor, K. 626 (Completed by F.X. Süssmayr): Sequence No. 6: Lacrimosa dies illa (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b88bfb100de09b18e72a482425e2b0ecafaabbbd2dfd9eb88c4a9ec498db7a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/PLA161521008.
Requiem in D Minor, K. 626 (Completed by F.X. Süssmayr): Offertory No. 1: Domine Jesu Christe (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb59abce1206a405d168ec4d414097ea12fe2011f9a48a27bdbe7db311c6190b. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/PLA161521009.
Requiem in D Minor, K. 626 (Completed by F.X. Süssmayr): Offertory No. 2: Hostias et preces (Chorus) -
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf87e6e451712b78328302bfc000d75fb62100b7bff40e6e9e3f10acf1dc296fd. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA161521010.
Requiem in D Minor, K. 626 (Completed by F.X. Süssmayr): Sanctus (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd00ca4cdf98e8bb2823dd0c97d2b56f71c653eee8ffc708a7cf0c997abd17550. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/PLA161521011.
Requiem in D Minor, K. 626 (Completed by F.X. Süssmayr): Benedictus (Soprano, Mezzo-soprano, Tenor, Baritone)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcae1112b50fc153699b622f25f421054a1b3a0cb3e63e4409a888d5f34947ed. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/PLA161521012.
Requiem in D Minor, K. 626 (Completed by F.X. Süssmayr): Cum Sanctis Tuis (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb32d5018d26e57ea21eb3d503bd2738306bb25c054995cbdd7b4083ad163d596. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/PLA161521015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ffbf5542bd48bb97f79917879fc6d192e8a0cb5e44890377409bf4b1127392a. 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/PLA161521016.