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 0x609d9091b149ce22c49223a978130e5d546ae3555af7674b4a182dbc2a8e30c1. 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/9ba34fd5-40c1-42ab-9eb2-665c74e0fdf7.json and https://artists.proofprofile.net/proofs/artist/9ba34fd5-40c1-42ab-9eb2-665c74e0fdf7.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 0x56b4e5c87e1a42fd47acb478ea1183733c4e830381d1514461b5e0f0d44aa34e. 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/QZNJX2048410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5726b706f09f1c28907f4df5a616d334f246fec28ae3696a1d1e3e54b6212621. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZNJX2276462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a106556b88f55eb81a96a357e5e611280e6b5c25ad364ed2b2ee183af132a1. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QZTPX2236690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36b424d155b3284f8a7ba64866c187ba982c292ad5279d11b4ad404711c19970. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZNJY2322822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf4a8759f2192b46b0bd0426ebac1bc6eac7d7f845ef27eff9053fb20b1e1fa2. 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/QZW9L2360372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebaf72753fdd3a814fe821d9129a0107bd26b2559bc5645e91427e2b4fcfaf8b. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZMZ92468039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0591466d3ec60b996e03698a8dac67f4237014c266b9cfbd5267a4baa5e8071b. 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/QZW9K2463465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4656575fe691523231836e8b1f7fa76c360bbd4d4b4bed0616621bd68e84cd9. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZW9L2462764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe80ee44ff0b17e7f1414b2b6afc6bd71a3b609e1414f9545066a301d071e9aad. 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/US7VG2513968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36bd4a2cb1c681a90b187b6458bc6f0979c01a5fe5f50864f5536f23bf124483. 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/QZMZ92586569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bbf55b5110aa3728e6f7f5ae9ef27b4b01a40b9edbd783e6d687525cafc442e. 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/QZNJW2515346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9536665581c450ba1fd79ea5ddcd79338f36209fe1db2f72fb41254cb8f39100. 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/QZNJY2306227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7a3cb7ed1012634eac766451d0589c84e43363a209fe1029157f34260c2e41a. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/US7VG1947642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19c195631269daecade4c248c0758281c5d39681b4bbc6e65cd7f2489da59456. 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/QM3DF2467040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9803b0293bf2f3b705b10efdfe495665c69a15cb24b7d3df2c2866e1ac331ff3. 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/BK4DA2415732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x502b6772aebcfbccb8c61c8c3b282c52e7bb42b7947aa4d036586cb36fe518df. 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/QZTB42211242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd94e58ca70adf665f1e8ebb602ce281c54397df5bfc883b3897739f5db35faa1. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QZTBB2329123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x555b0083615b68e0d4f4043cff64c254a96257c7e00bca1c205f07d0725fcf39. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/QZW9K2434223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dbd2a675eae1bd1bf4a1e9a0224572766daeafbe6b090bad421313758691656. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZW9K2482369.