thumb|upright=1.3|The choirloft of the Sistine Chapel in the early 17th century, depicted by Agostino Tassi (here in a 1848 copy by Ingres). The Sistine Chapel Choir, as it is generally called in Engl
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 0xd159034e82d55cbcf463cc42b9c8992b892fd50501b7df86856b0901a684cb2c. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7adba1a1-7c9d-4f04-9159-05509e34f5b5.json and https://artists.proofprofile.net/proofs/artist/7adba1a1-7c9d-4f04-9159-05509e34f5b5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Veni Domine: Advent & Christmas At The Sistine Chapel
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 0x6dc2db790d36455cb647afe8bb9b76663ca4b7f1a942bbe72455df259e2b0822. 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/DEN961700800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8c803b6bc845df441b2e8a348097cc36a0f076b0c53cb21b86fbeabdd1dd7ad. 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/DEN961700810.
Motet "Hodie nobis caelorum Rex - Gloria in excelsis Deo"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f33db361140095642ff440433ac6c26578c01c48c3166558c495a31d1d71e28. 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/DEN961700840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x939546fa9f8471d58822fbf547e02d5afa38bf5b73817409eac5285466e30202. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/DEN961700890.
Motet "Magi veniunt ab oriente - Magi, videntes stellam"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9d6f7073d27f2be311040ba46bf3cae03af24c311c2a033b432a13bd6a767e4. 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/DEN961700920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbbb2b25eaadbfb4356476004912238f0dc9e6b4a769af6f3f98ca9ebd4fcc73. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEN961700930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7200aefd2e1fdb77324a2c407237ae9554350e523631d402353e62197e86183. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DEN961700790.
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 0x3f53d9ab4cffeacd095394f4d06f1575a7d9072fcf666712bf722e6382c47037. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/DEN961700820.
Motet "Canite tuba in Sion - Rorate, caeli, desuper"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0a277391d81b2a4567fe8033c7df8185c79778b1dc7eb9d8f79c6ad3d46a653. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/DEN961700830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e4fdb9e8af1a891c09ac1c51e4667f04f893d5e4a0f5db32fe612299c00f190. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN961700850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x868bb034a73fe07691a5ab08fa74cb26bf13ecaa25ac189dabc403c3139e83eb. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/DEN961700860.
Motet "Quem vidistis, pastores - Dicite, quidnam vidistis"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36618ebe2a6c468ad2b529482b17b59b29052ee602a859da6e7148105b53183c. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/DEN961700870.
Motet "Dies sanctificatus illuxit nobis"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaa3fe9601adc8c8c22a0114b2476d261ad2dd0131c16d270aea7edb4c2c6609. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN961700880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45c2523deb416f8f58d833e4647c73356e42f78c665b62ac6637a2c052ce088f. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/DEN961700900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d4789721ba8d00350be5f57682a89b93426ce244867a431f94424269e9dc63c. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DEN961700910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa23907cb36329f773e6e6a5574cac2a26c9126049472d077ffd3e7b9dde1b2de. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN961700940.
Cantate Domino - La Cappella Sistina e la musica dei Papi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26774455336629652e1b3d61fbcba3aea1195d2a055368d5fba3238a4db57f57. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DEN961500540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddc808c2b070f315c9a10070a60f8c28b90b0afb4bc1f0538028828f57ccbba2. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DEN961500550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74c3560c8ea862b6eb9ace0a0338cd89fec78eea6662421232d3bc6df052513a. 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/DEN961500560.