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 0x159dcb458fae4fd3a8146a9b1039e2cea513e57a633ba210037d21ad96c8a2e4. Chain 2 (Bitcoin): anchored in block 953614 (2026-06-14T08:40:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1845d2c0-c9ce-4cd4-9b52-d7a3f640c716.json and https://artists.proofprofile.net/proofs/artist/1845d2c0-c9ce-4cd4-9b52-d7a3f640c716.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 0xf2321205298a6e163280d0515588760ef814dc8f908c36ee11f355ade9a9d6c3. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/ARQIW2503529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b87c41a620638ede9877da5c76890b03242f8270949a28b4a1b5ca410bcede7. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/ARQIW2503534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e84b0c7ee7e1bd7dbaed4899cd827da8314f8eedf77aa7ef36a62e62af24d6d. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/ARQIW2503543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d1735edda35a8fd04da854bf59671e2fb3250051dd91b7ee06ffe433651e58f. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/ARQIW2503542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84c42c32059fdabd9109ad93db55a27a4d4f3b2a8804bf33ffb8e1f7f174dc9. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/ARQIW2503535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0d7ded90d3541277730af48f2a84a748e70339f75191e420b5f450adfe93546. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/ARQIW2503528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b8b0aebbca69d342963979261606a54214e3fc8c1c7f70fe5c5d35bf2614303. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/ARQIW2503537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72478cb9524e13a8010a31e98b3a1340a2ff7e23bc09b7c796c865e3be75ba5. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ARQIW2503525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79e1c41d7218a4fb34216f3207b6d919c863b6ded2e47d0cb687f09c30b5af21. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/ARQIW2503532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c87cf04f99f35045ac5b26ee5de8b90bb0f94f4422a32e8948185ac3274a320. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/ARQIW2503539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f2f37757b42f7cf7c4a3cc6d96587398f95429c383f0d4140833257a893a827. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/ARQIW2503533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc96c51303e1c45c7622c9190b86e4c03542f999f9e92c0986919fb60d4c8234. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ARQIW2503527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec83845d97ff50c1e816717610726bbef8f57874d76bbdfbeba1e4d3f9fd7a87. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/ARQIW2503541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x256ed3cbd46cab96c4a5b4dab9122f70c019c3c349c3f7552305f190f3094081. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/ARQIW2503524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x632d0e23e22ee08d3bf8f3f1ed5889f5de3067686f77a899dc2dc658e38c1880. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ARQIW2503526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13e9d95295a9c87844401d312772d09ab39923799f65235b0876331c56143ba2. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/ARQIW2503540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x268b60fe94c289e3723d6590291d854b8bf4e5dd4027ac72c1d623831500a513. 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/ARQIW2503530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf113133ea1c728bbdc4b3539ead7ec02961749087bfd4c3355c8cea499ee2c24. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/ARQIW2503536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07543586ba8de74ff2be4d2bc8dcd154f518c13d4e01687b39100787825dd29c. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/ARQIW2503538.