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 0x622e504b10f575dda62fc4375ec8563f829aab04a5e8992856ad0b7c6937d785. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a70a56be-b75a-4b5c-a399-388058b4f6d0.json and https://artists.proofprofile.net/proofs/artist/a70a56be-b75a-4b5c-a399-388058b4f6d0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Messes des paroisses avant Vatican II : A la campagne, à la ville
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 0x617703a934a11bd5849b71e752d3ab53370528b8c1ecbd65ab54c9f93691e7fe. 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/FRZ177201090.
Choral, BWV 732 : Messe à la campagne "Lobt Gott, Ihr Christen, Allzugleich"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92ec0197bd1dbfe7078ba92487c1c6f507735d0e6842f816f3e9cf6336c3223b. 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/FRZ177201100.
Messe No.8, dite des anges : Messe à la campagne ''Kyrie''
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ed69d7fa6ccdb80509e758f15d3307bf6e34783fd7f3c48ddfc680ca2a880bc. 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/FRZ177201110.
Messe No.8 : Messe à la campagne "Gloria"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x853f1a1d1db0244819a65b2e82bf84ca18d378598f8fff1a3f30a702babbfa5b. 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/FRZ177201120.
Messe No.8 : Messe à la campagne "Alleluia"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f7670c0cd7ffe56faf40d7f1aaf6b4d6b418e4a2e25a2084d38ad57769ee0da. 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/FRZ177201130.
Messe No.8 : Messe à la campagne "Evangile"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb62bad7c95f6ad51f69e5efc0b02a572320e6e702c26bad4fdde50ac94688242. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ177201140.
Messe No.8 : Messe à la campagne "Credo"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb204aa42c071f578613d5fa4b79d16333bff861f8f89c379ab86d36f873ec00. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/FRZ177201150.
Messe No.8 : Messe à la campagne, préface
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bedec3677a04e30566506c901949405e3a8f41dad22aad8416d6e42ed07ea7a. 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/FRZ177201160.
Messe No.8 : Messe à la campagne "Sanctus"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfd18ccae384ed271671455198c17d0350ebf215f90cf279be9d7edd69a4294e. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ177201170.
Messe No.8 : Messe à la campagne "Pater Noster"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa1a91bed1b06fdc554d4e4cbd2df261063b6043694c3b9a58a8d436f876922. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/FRZ177201180.
Messe No.8 : Messe à la campagne "Agnus Dei"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb448db0479c96091577f2dd8b11f6e83b1311872c4b0c04b8174b19736cf6b8c. 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/FRZ177201190.
Messe No.8 : Messe à la campagne "Ite missa est"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde8b844ed70149fd736000a1b6d86499a5404bf3fc5ccea21b669990eeec440c. 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/FRZ177201200.
Choral, BWv 615: Messe à la campagne "In dir ist Freude"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x901de05e0b4cced26fcaf910de24e9c355db5ad00f1452b6dea88c8b31751ff8. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ177201210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x881451b7f0239a54c9bc28719e66df1af7739e2986bd85a2319add7a7b43dee5. 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/FRZ177201220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e871f7a4547abca6bac8d591b0770a7493be68913a147524c9b1c445c0f4732. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ177201230.
Missa Ad fugam: Messe à la ville "Kyrie"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec51fad0ab0f3117741327ad30b2a0913b24fd10f53340a9bb00c263a14dee86. 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/FRZ177201240.
Missa Ad fugam: Messe à la ville "Gloria"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbafeedc6f250ec83c7ddb0d6e73feb38bb5e962b84780fa5f27e1b21df4e4f5c. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/FRZ177201250.
Missa Ad fugam: Messe à la ville "Alleluia"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce02ea7ce6a7331d43120f50a7978f3ee4c9f438f7aa147596d86e474057db6. 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/FRZ177201260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa2c454023f48c0abc68179d7e20c753a60936c5de452eed48f63f1fea0c08f1. 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/FRZ177201270.
Messe royale: Messe à la ville "Sanctus"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70e446b4c8aa40cb1005942843295b6026ef3f696c8b3f8bdfed7f562bee9231. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/FRZ177201290.
Messe royale: Messe à la ville "Ite missa est"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5de95cc8696f0cc64707a6b23b1fceb565b9d13a8e5678e8191d6e48d10af342. 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/FRZ177201300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76ff71f515f2c0a31c7bfd017a269c00f5c59b431fd4fd85302277393fa7eca5. 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/FRZ177201310.