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 0x132e3e0a37213735e942cea5dd7c13b63684c92d3ff8783790b4230734c94b7c. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0ef87d25-439d-4d3c-a4a3-979bc8e9ec78.json and https://artists.proofprofile.net/proofs/artist/0ef87d25-439d-4d3c-a4a3-979bc8e9ec78.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xb86ca6c77c4c708458ea31a1c588169923dd9c68d4e9c37dc58fbbe7de1a842f. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/GBJX31964005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc082d76c8b253d7659a2b0df9dacbceaf1e4728914bd3f7e896d1c10909b8f1b. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/UKA2G1901048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x254adbae89d462bd9787b2ef56d8d3d500382ee33c6eecc94176056d688061f2. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/UKA2G1901049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce502aa4a95f6ab2177ad0c70df21d96047eb1fb50e784e6e2ef55513c625bb7. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/UKA2G1901050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b74b3075c1b453174e6ad83fde755925a2a480766e0125a77241c3f759d0702. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/GB2DY2100664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49713ee7b5e77563791f23a2d143b22514932ef2087fa124af1f284568751438. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/UKXN22252610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2afdef47cb05ebd87c98cf156fb2325eb4330ce94abe98f8db438c55a4738cd. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/DE1FB2400362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d306223c1fb65704190609165cf79c319a47b4f9eccaf8edb297af79517fd05. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/USA2P2478504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd676139a1dad2048fa1d989064c90778c7cf142ed9c95446de97a7d77a7e3172. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/USA2P2478505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe20638a9c5c2a3b674bebd4f3a7fd7bb09cb1fe9b623af96e5e0143c2f80da42. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/USA2P2478506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44e4b6252c82f56d6955bd9070f1440017357865f91a8b6e320a3f3cc8187623. 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/DEPX42400701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07bb5113174d8a8910d6187108c040598edc9597251276790ecc6cb3618eadd8. 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/QM6P42152770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f38bbbd7f3e81a870e5085cab2d57db31dca7f766496be7e752a2268b78824. 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/UKN6K2300381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd4580d5cb19957a8b5fdb8e5483b699648b15bdae83e722d08521cef6a3921a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/UKN6K2200765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x788f920b2a0d3c66f0bed9596b0c25d699793ea77ff7f35cb930284e59aa5e05. 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/NL1AP2029312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1da4622427c74faacbd55101da156c696485bf0b23feee89cf87a0660505d5d. 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/NL8FJ2400090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb70f21e79b7521412f1c16f0a29d510ede3d0374a18bf8bf3eeb36a56b6aa16. 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/NL8FJ2400091.