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 0x144882ac3817ba2d54e8916b3bb17570abdf0dc5e5fe65485dfeb4e0f4c3a5e9. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e622928a-ce3f-422d-8668-e4c8feac5a11.json and https://artists.proofprofile.net/proofs/artist/e622928a-ce3f-422d-8668-e4c8feac5a11.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
De Orto & Josquin: Musique à la chapelle Sixtine autour de 1490
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 0xd1ea2693ee5a7481daaa41c5f6b5a2f276231d092bf1485a1c9e3c8b665c3fd9. 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/BEX602307001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x860027bf83f4e5194307136c759669c5dcc8d443d4da218008cc898fcf516e9b. 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/BEX602307004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01700ba3ecd95f75a80093768735f875f5a4e36f9444428061ba9ba2f54bc260. 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/BEX602307007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18baa317a21243104837e0258d79d43b71ede974059e3df9b96d95aaa9d4118a. 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/BEX602307008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ece487524e0e51206ffa069711c5cfb5705362f6588ab838474367f8bfba33. 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/BEX601995001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9141ba8d2cfc70bae4e6d9d46b086a16231711e99ad4388649cb101a66c54a31. 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/BEX601995002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe34e18b0b8d99a1cdcb4d0a295322b394d5683ae4a5e8852451e4310f8ab50de. 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/BEX602307002.
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 0x9278b2ee45b6f2ee6f4cff1889fb8ed5257bf6300dc2dd3fe9f6116559bed10a. 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/BEX602307003.
Ut Phebi radiis / Ut re mi fa sol la à 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x409f6ad51e8c988f1ad1a2e389726d237c04236aebbd24886ed8db3a70e3a4d1. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/BEX602307005.
Stabat mater / Comme femme desconfortée à 5
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d24f54f11f80023be275143a9918acd6f82c3671f1f4b3fc261183b5047a004. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/BEX602307006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7960cfdf11f1fcee6edbacab3ec66c7577205af2bd3f7882668e6d13a30165e4. 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/BEX602307012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x319b37010ecfa8d4aae5ff99a1f3c3debe8a5410dd5f26e11f9639b0a4b58e95. 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/BEX602307014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc84ebb1d4b1559ce6bf65ea1b0c1e9eb7a1d57c300e94df49658c09f2c378a3f. 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/BEX602307015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48d20203f1faadbe8c3b9a9202b8e743bd28ef6262ffb0a450af5292986aafe1. 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/BEX601995003.