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 0xc552d25d47a659100a0ef7b785d77df2d709b148afe0872bd4bd0bd24d4db44c. 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/f8778c7d-f7bf-40b9-ab6f-def8d75c2e15.json and https://artists.proofprofile.net/proofs/artist/f8778c7d-f7bf-40b9-ab6f-def8d75c2e15.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 0x07bd7aa78a0941cc3b8febe2168d23d682d706fd7b03be063b9ae81e66debad8. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/FRD0K2200210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x128c4d92ecc96803b9a8d8b8e770280161d9be6d2f813404d6ceea90a9221392. 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/FRD0K2200230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8829d74a8a0d1fab10962c60aad50fbcf99b982b85a98c6f8df0a926d731035. 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/FRD0K2200260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fda17d95b98ef070e5cf350d149e6cedc5e52ac343fc90b6f27298391f5db45. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZTB32392326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5dca19301771fe7a5a80a56aaa3a871d8d3ed92a5cc207892d1a14ffbbe1b11. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZTB32392327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe74cbd734d19ad24122a9036f0e656ae39eb0e1b91330439fed3a97541b6a7f3. 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/QZTB32392328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a67d744e71851025139f2182706f1a81183dc0cdc0c3695b22f663460501f16. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZTB32392333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7500f9cb6bdf5b2eb5578f60fc14756f8c8bd6169bdfb8dc47f02648e83344a4. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZES52434759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac65d46a490fff3db9cd2c37a7cc6807845010197e1f595bfc26f58440ac103f. 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/QZTBE2370125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6830213f733985eb496292e31efa6e347a8bdbdbda1cbdfaf0170ff14fd6c70. 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/QZES52434761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54c1457e633e5c18f8ebb563198fca3506247f5e62fa6a254aa13f4061c85231. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/QZES52434762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf612fd0e2445d585c32855cf64251024e7ac235c70e8f236b62347a72b977b6b. 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/QZES52434763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db71897676d736891f4943e9b16ce0117368f92eb336e82fbee47f33ad2b2bd. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZZ7Q2494297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eec0fa57148be05709d72b49307ba11e0fca5ca8c9549bc7f0791d935c20485. 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/QZZ7M2525938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd825abc00004d4799f9740a33ca3b2ed8d154aee2aa2a2c156fba8522440b86c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QT3F92512746.