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 0xf2450c05e2c521dce6c4fac3e957437d7d0a0b6666ae2e5661a5213109f77acb. 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/254b2fdb-3132-4cd8-80c1-0df1bf2768d6.json and https://artists.proofprofile.net/proofs/artist/254b2fdb-3132-4cd8-80c1-0df1bf2768d6.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 0x4d367bb7ec0a960daf456c2cc377de2efab634382114682749710320075595b1. 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/USMH92386290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb2e55cc128a8790662482906423a73abf8514ea0ecf73447b2146385c7e314c. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/USMH92386293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb78ed09219101a9adefea47443a8ebb83a0635d46c4633119febc44fedc2f4e1. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/USX9P2312287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42d91e79f10b7b1169d642af7226d707f009d89e9e58fd858373f340977cb520. 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/USX9P2312288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85e2380c57debef38a7535ddc9b1e2de32d07ad133d46d114570228714939f63. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USX9P2312291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bce7247fe5d9fc3f1cf702faa06767f068bfb7baa786e25ec14e58f284c0884. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/USHM22468493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9abe49badbb00edb81ba786add7c7aeda730fc59a7aa0d2688b948830a034db. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USHM22468494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09f5114d32790a67c818f554a3bfc1c377368c34e62d7529cc6a8a29671eb47b. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/USHM22468495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5078dd2f07896c88f6eb39481aed05e9b8e04662af94e2b30f156baa3919bb3. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USHM22468496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e634966dca69d5d0806f06ae83c07e13df1fb400fed11bf1d3ffcae5c2ed8dc. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/USHM22468497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x404e16321bee59473b9fa0874d23f1b0cd316cf5c3fe8e8468d78c02ea1ed9df. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/USHM22468498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33722d06d918acbd7ef5ace0270aedb7b124d9697f7c3709ed3c4a72cf0179bb. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/USHM22468500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82977cdbc9329724f49ee57dbd4f849696a991e1681222c8a36e0dc6b274f534. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/USHM22468501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1829b3e631e309ce5a0b06b03d51757b722d7992e51723d9cdbecb41bbc4ae7d. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/USHM22468502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7f83604689d782221a7ae963d6194656e1d0afbe12d4f5420c4987e49542689. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/USHM22468503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eac08bae32a89a8c4cc7a11ea8c7f09836e15b7fe192c818f9d0a0dec3ee436. 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/USY242426986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28e24ffaec0bf9a59d363b787037de06ff9d66b70894cbeb82bdf4998be7f52d. 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/USY242426987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dda85072a17e44211f804146472e1677f5f0e2eac15ac235199bac4935d28d0. 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/USY242426988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6b3d2fb14d14a19ceb7094b5da45e065dd817523053b6558c5d5f85d46b2e86. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/USY242426990.