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 0x0d3a33a917b826fd77c2866513308532ae6a76589e5919db2c1b3f05364d017a. 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/82ad3600-eb43-40ee-8c6e-e61e3deefb09.json and https://artists.proofprofile.net/proofs/artist/82ad3600-eb43-40ee-8c6e-e61e3deefb09.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 0xcdef2a839592fb5ab5cb251fbb9f1fdd8fdd2f90886af7f1f31e00d585ddc8d4. 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/ATPJ41600024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x476360ea01cf459a3a658acac235f392800111a04e8adc39c15a7280a4af9c7c. 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/UST8K1643224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01fa192a59956d636f6a460f10a2b453b65246cc4d7064a6095d610abf97c837. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/ATPJ41600020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc00193c2f8e65690d79b984f0e5066c677e400be613fe09fed73888000562e23. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/ATPJ41800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8204c19345a1d4fc80822697bffcb2da3931317c8148ce07f983481d56f946ef. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/ATPJ41800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf853a27665ab93e0daf41c3b0493074ccc9e4df855e6f64419f94db79cdba0d0. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/ATPJ41800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x675de04d1d554a9c333d255f44943ad7ccce91f51c7c95784b611f2db0220503. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/ATPJ41800104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66d698fa7aa75e263b5b6bddd61e20ef0e4af94bdd8de01f64f09ef6f8fbb975. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/ATPJ41900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd66ad3d297ab7d0a85aa013bba664398acc30eaa5e25e2b830b1e3442ad914f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/ATPJ42000100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dbe7ee292f17f473cf23b910d76d3f276851a21c398b3490f7bf9e2aec6c5cf. 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/ATPJ42100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71720b41c5d2d003baa63e09d97fd2529af12938edf158ea7d4eda8d25a88cbf. 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/ATPJ42300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5a97a681902cdc24403010f6c593755b29082fc2492629b58f2539d8d0a8301. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/ATPJ42000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd663d6a0454fd8fdbe9ec70aab4cbdb48ac517ae6984364398e6e2d02374202e. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/ATPJ42200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd66ad3d297ab7d0a85aa013bba664398acc30eaa5e25e2b830b1e3442ad914f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ATPJ42000100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43cac1157393352f5d2227d006cda028705d845474cf8fa0b73567210689f771. 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/ATPJ42400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3091f165bd5483f1e04379ec3c61df28239da56341edb4d62ab28480cf4cff1c. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/ATPJ42500003.