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 0x2a103d9059c086b10599903779ac2bfd6248f1b7fc81971928d1f995055c3c50. 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/8802548e-3f83-4862-bf44-020d099112ce.json and https://artists.proofprofile.net/proofs/artist/8802548e-3f83-4862-bf44-020d099112ce.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 0x71d8b7d1a81d01bc6f196a823cc1e1e7cd57c218547d0f6794aaead261160c45. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZHN82096716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb29c666c25fc1256ce6859d222f2d657b47096f7e8aa28fd81c3f59a69e0ef4. 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/QZNWZ2012747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e2c1ee361772fafb9aba403dcb19f7b9f29bd539f79f50fa17f0ee00802e6a4. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/SE5BU2187360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x147a3ab9afd31cd6aa092527f76177adc9bf4bc6efdd2a516723731dd55fcdae. 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/USCGH2178160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71707c40522ace00f92cb243cd758664989a8e0e898b6bd10c4b79c1caf297ec. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZDA52138723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bccccbc1f01a367a23d96610cc4098b1a7bb3c0e26f362e423f215a43664f1f. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZES92171278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76928a603333d6759433827a4f9fca2cd012bf0494f2bef369faecb19861a93e. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/USL4Q2123751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x468171964a2784284a7808c17efb1c7cb93fd2a0cea5768361c71f9418314fcd. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZNWV2126129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2990d9313db8d9bd7b011864d99ee37c7999ff4e091f3ed6b2cc4746bd142f02. Chain 2 (Bitcoin): anchored in block 957965 (2026-07-14T07:07:52Z), 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/QZFZ42263183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7a93c6155fd928fb3cea2b8b8cc45dcfda15a5612559b709bd028524713a5bf. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/SE67Z2200101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b29d29667aaf0a0f226855590da7af9cdd1c6c8e1225ee592ec6b4397da3f98. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/SE67Z2300201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x266f4a53e925b7b760a46bdda6510f2875165f00dc21cd3d92a5aff5fe3d8d48. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/SE67Z2300101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab2de22f600bc6dc16d9efc82ccae78a4990a23d68dc8698fedcc79a23bc6528. 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/SE67Z2300501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb1b4bcc6f8f8235d41d4f87d3d34bb98d5e50886e7a88ae9b2e34f39c69470c. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/SE67Z2301101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x679b161b16bb32314f97db233fe7122007684d24cc801dd8033309d49ae31f5a. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/SE67Z2301301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dc3322f0dfdc8b22f59112fb9bc883e25374afc571900af378f12a68edd3851. 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/FR9Z62300534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5cf1ba229680f02d8792bcd7d67a3245177f82d42f33cc7631a0dd1c588df14. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/SE67Z2402701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x990ac7ca574976a53d7667bfdf15e48e8dfd359a18f8afa871546c84ad1e4b67. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/SE67Z2403301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71e0ead39ce0002628408ff3253233c2a1a2c72db0a45a5c287ce91835cdaac6. 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/SE67Z2400901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03e7e26291af1c172f236b2158062d51088e2ac7274b4e5a8bad1ffaf4f675b7. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/SE67Z2401901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67685ee377c7f05f0a0b65e9ba1a6dc11afcdb4821417356c6b0386aaaebf32a. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZHN62083094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6460e55ec9fb2508ba4186bd0da0ae98b1c8f4d9854ac9fe50726252a6a59e71. 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/QZS652276060.