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 0xe6b244abdbe52aed981336aeecf7293cb9debe192a60bb2976a574ba4b18081b. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4c71498d-2b95-421c-84fa-9df376bc8a30.json and https://artists.proofprofile.net/proofs/artist/4c71498d-2b95-421c-84fa-9df376bc8a30.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Joculatores Upsalienses: Early Music at Wik
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 0x27cb3faf6dda7c44fc5508786b7c49ac0f3cd431522f4adef23d0fc6afc8953a. 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/SEAEA9003010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf22b183ad386aa0768b4c8c9b9333a9bc36020253ff0445d0a189e07d1da61fa. 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/SEAEA9003020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd740b8ccf00ea32f2f445c100506189adbfa7f4cd9bfa7d21b34e1474247b2f3. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/SEAEA9003050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e4edb7f1e0d6ee2d9777e9de2913567cb2645f1aa3dd091d803b856c8847fcf. 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/SEAEA9003070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe6f0e7972a038b65ac730e0cf78264bc72c132a3c6a3a9d1a84cc158b480c0e. 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/SEAEA9003210.
O rosa bella, JD 54: O rosa bella - Quodlibet: O rosa bella (Anonymous) [Glogauer Liederbuch, c. 1480]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b2d4e8c9dc1ed8dc3bb894b67feaf42f9c5e9e80a5eae0f7e773ec621242702. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/SEAEA9003230.
Joculatores Upsalienses: Woods, Women and Wine
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00a4d02b9583e35f774436e8b4bee0f00b1dd4f83432ff9cbbcaa3cfea83adf2. 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/SEAEB9020020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x602edd41e96c0f5eaee97a351593451d5b1ded4aca07e8ef299be987d0fde982. 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/SEAEB9020120.
Under der linden an der heide (Arr. S. Berger)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71bab32d9bd22fddd71e2cf76f70bb8db70ca74c01130be6a0e2f4c089924eb9. 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/SEAEB9020200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f322fdcda89da2bd79b01ef2bfc1ca6a3a1e21c3599d5b67091da9e9049a16. 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/SEAEB9020250.
Joculatores Upsalienses: Four Seasons (The)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23bc55c4c6ff694306f347c6168d139663857a6c21917218679eced7291c5673. 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/SEAEA9075100.
Rey aquien Reyes adoran (Cancionero de Upsala, 1556): Rey aquien Reyes adoran [Cancionero de Upsala, 1556]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb81cab0a719c3744149b8ef67a2a5de30f24fd4ebe53ce6f1526c08d365dec6e. 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/SEAEA9075310.
From Liber leviorum Carminum, Antwerp 1572: Pavane sur la bataille
Evolution of Classical Music: The 16th Century
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbf8a781c73c1dfa2c1ff1f2ff8d4e2f07fde33a38e8a9b63312d0f4a37fefae. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEA9003080.
From Danserye, Antwerp 1551: Basse danse: Entré du fol
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6979f5bc84c3c636445eda9e2adec5378869bb713a1af341cdf041a3a8a4a97f. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/SEAEA9003150.
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