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 0x517bbc578ffca14ae319588c93520c1f151c18731ae49fe86a633b13f9ba3368. 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/295b0c3c-c3e8-40b3-a6ca-cdb5cd84cb81.json and https://artists.proofprofile.net/proofs/artist/295b0c3c-c3e8-40b3-a6ca-cdb5cd84cb81.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 0x156c561959a6ba1f07dfe11810f34d9ef85f1514d94cd04391d164cd75cec1fe. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/CAOQU2000419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed8e3d44a7f56c79264a6c07dd829a23bfd51ad50b6922a825c9328b0e274a7. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CAOQU2000383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bfddfcf333bcb868ecadec36cf5ef8ce35337bf79fae59e4a39c867d34f0755. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/CAOQU2000384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aad1879549290e639bc4620e0b8aacff4aafb7e9b552f77cda0302eb2cd2a5c. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/CAOQU2000385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d33eca5990e6abc1a5ef85332a507bc2129a9131e823f76c28656a1ee0af2e. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/CAOQU2000388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x617bab3feb47595d877148065d060847e1f660429c6fc577d52ec471a153f581. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/CAOQU2000483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1a8c4bff41f4f121c35a4e456a407aad4d3bbe903471cc681cf2ff4e34090e6. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CAOQU2000463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fe1c6e74e14a63fb3c8e8093618883c08f1b9dd98b6cfeac6efea38ed9a69be. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/CAOQU2000453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe59b4655dee2058fbb009f2bc369e5d0b14b1dfd509d5fc79fa9a2de6914ff9d. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/CAOQU2000458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9cea5f02824c05e54a83839bdd2f79dfe5ae939e1624788136c668f77669734. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QMFMF2107925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba28951dd3218cabc81b5c611936aeaff44f011d8cd2f0abdca4a83351c992b0. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/QM6P42481323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b00ccc4686f32f4a80285a70d604c9d53d6a8f4ee3923493b07f19357a7f0b1. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QM4TX2560303.