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 0xd4bc97dfe3e2959f39e31a1ebc1fd15391eb59355b00e710f4af01a90c57e0c3. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/227d38fe-c294-4a36-9f66-d2119da7b538.json and https://artists.proofprofile.net/proofs/artist/227d38fe-c294-4a36-9f66-d2119da7b538.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Requiem. Missa della morte in C: No. 1, Requiem aeternam I
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 0x98dfa8895f98471c74394f7a849246a8eac9c327a588123e30025b438726f8c0. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA162100944.
Requiem. Missa della morte in C: No. 2, Te decet hymnus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7250025b34d5756c5086e37750c7ecdc40ab5e2ef8fe8e9c0a51e6c2eaad543a. 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/CZA162100945.
Requiem. Missa della morte in C: No. 3, Requiem aeternam II
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5848c9c5ab90d7ad157dcfff15954c7f697033955c1b29784dcee0ff0a5dd3e6. 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/CZA162100946.
Requiem. Missa della morte in C: No. 4, Kyrie eleison I
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7adc18fa7cd4afa1d16a3bc77a565b56f4fb1302b85ba5bf25770d3fd758b90e. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/CZA162100947.
Requiem. Missa della morte in C: No. 5, Christe eleison
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02744b906b4f013258000d5a70c937d4122625f8b9e5414a4af505e375a10541. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA162100948.
Requiem. Missa della morte in C: No. 6, Kyrie eleison II
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59872ad90b046c895d464ee42b4ee524db1de3ce4add53454ac93e25751c1405. 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/CZA162100949.
Requiem. Missa della morte in C: No. 7, Dies irae
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ca51afcdc1257480760a5cd48e2a6f999702b0c7a8dd75f6001e310c891ee79. 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/CZA162100950.
Requiem. Missa della morte in C: No. 8, Tuba mirum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74353b3a745a6e57a90b0a2b9b8e0bf05f2cca72a63056e1f750c8229c5a529b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA162100951.
Requiem. Missa della morte in C: No. 9, Iudex ergo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc41c1db94740b7f75599a143fb67a7a2245849187817da59582b0cc224479747. 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/CZA162100952.
Requiem. Missa della morte in C: No. 10, Rex tremende maiestatis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa09f918831a3fbdf8d285637a3f73fecbd6ec4f7ec770241610a8e45607e1008. 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/CZA162100953.
Requiem. Missa della morte in C: No. 11, Recordare, Jesu pie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd87b92629af0d4df43d6d9d641e3cd718293bb1891e8531b27167842f394fe74. 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/CZA162100954.
Requiem. Missa della morte in C: No. 12, Iuste iudex
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe07e3804c700c49eb5e1da75754dbdae241ccb22eef9ac420b103eda4861db62. 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/CZA162100955.
Requiem. Missa della morte in C: No. 13, Huic ergo parce, Deus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05e16f0c1613e7a2c1a4679377f045f91559c3a00561f3e04fe35f8d242c53e6. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA162100956.
Requiem. Missa della morte in C: No. 14, Domine Jesu Christe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03720d20b2118299d194402c34259fd48c41ec075db82188ec217239766e9662. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/CZA162100957.
Requiem. Missa della morte in C: No. 16, Sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4468abf9ead319c4dc39ec4cd2776660eba1fb4cb69c3cac144dea0789299cdb. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA162100959.
Requiem. Missa della morte in C: No. 17, Benedictus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e2ba8cea0a2a3a2650ac4af0cd0c64fa58f895d1888be4f3341d274b42e8daf. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA162100960.
Requiem. Missa della morte in C: No. 19, Agnus Dei
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x999c773cdfc363f38b5e6d161b33724dd68cbf5cbc54d5a00b118933ebfea738. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CZA162100962.
Requiem. Missa della morte in C: No. 20, Cum sanctis tuis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef4857031954233923a9a314c47cb20bb7bb8434c7f15ff11ccf82e237bd4609. 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/CZA162100963.