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 0xcdd7ba9c67dca5feb3281f821a7b74a3af2ceb25a3ea4bbaf634a7561150f9e0. 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/75ed9189-df68-43fb-bea3-586317ec4c0d.json and https://artists.proofprofile.net/proofs/artist/75ed9189-df68-43fb-bea3-586317ec4c0d.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 0x5dd3da8d601305caf493e5e54f5a5d08a90e6a65ef123c46548aadcc983e7c2b. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/QZHN82096454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97dde1a689beaac4811f6dfb12f3175951a8429ca2a5eb3a1c9cac23bb05d475. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZHN92004141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x958dea297e370941bf46b4593b70ff0d39caaf1cbc791197f14ef3e6933ee332. 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/QZHN92001486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db50c827c480eed3e4f7523d9630b008c6c160655ad6610978f80c490376971. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZHN92001487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce506b4d17dc7b08e97be5055c15a90aa4a8ef8a797b8169e9d6543c6cea3ec1. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/QZHN32191718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4df26eea9a08ba78bcbb5c397da14eb7f9e204e5e25b8826da99cc850604506b. 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/QZHNA2129385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0c98c351fd88e63d1e69de767e9e266301f1400661f8d29895489c5c8a33336. 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/QZNWQ2167274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8be803e42b6b10e74b236357306a3a6ab63f82dc8a0bfbc1494e9cfee0646f. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZNWW2126320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80e230ec950fd26da26c4ae0b110cb3a106dce990653f1f026e2faf24a6d95be. 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/QZPLR2199424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x874146fc98716992757784bf3c3057dedb13444b4079d8f0e899a684f59cc01c. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZFYX2288926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ffca033ef59a3c1437f6d7dd2bf0087b13db31e93fc353503d8307ff40691da. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZNWV2219308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x246d3825699e1b996d41f050c4fe34ae1ac9e3643ce3b7a3fc76c29737b82555. 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/QZES92348575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79911c3082a6019173a84c65840e0061553a82803350413682971147ecf65c04. 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/QZK6N2333072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12d9b624b11064093e456312db2769709b1d2a919b2c25e71696852b3f53a203. 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/QZK6N2333073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3cf445d4f315be827456a699e570a4e59ba976f45298eef5d800d13784c41ad. 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/QZK6N2333074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd138f69dc4d0ca4f0b195b1c6ac8832d59612b03735905cc3ba2752d7d2c51d0. 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/QZNWQ2318359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0f04a48b9d9611a8a5cbf9b191c7efd6fcd1adeb1004510cc7a94986f548ca0. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZRP52399749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadbf9598467195d3c270f0f2d38f81fe9aee91f56586484089a223387ed9c60d. 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/QZK6L2232865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadbf9598467195d3c270f0f2d38f81fe9aee91f56586484089a223387ed9c60d. 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/QZK6L2232865.