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 0x344c144278a5ef850b45723ff094241e7edee0ea39e3c6c1316e042aa7b81f81. 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/820a8773-c08a-4d24-8341-d31d838b7270.json and https://artists.proofprofile.net/proofs/artist/820a8773-c08a-4d24-8341-d31d838b7270.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 0xff728f5517a56f737141d8570cc9785fee6c044a0bbfc678a9b763b1445e0d69. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NGA3B2214019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb99182b6bc7fbe4483f470b06256aa797a1056c3681c856314dc6ef5e6675130. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/NL8RL2404619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0e521aee55666908d54926f064cb7b7190cc5ab6f77ac17da40fc4782b8313d. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/NLRD52222642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ab053c78ccc947424417f4c6465b0d3672ddbce126960ef429c3a0df9cf9799. 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/QZHN42353674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9994b7626c39a19fe871209b6bf5298805dbe674edeb8885030871eb6930429b. 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/NL4UX2200039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60effff3d9223ee5071e66b2f17345cc84756cbfda113ec5ea51d202c77e4296. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NL4UX2200033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd9a147b3f7748b088cc460fc02e1aa73e29251cf006ec70ff9834cea0c08991. 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/QZK6P2136057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0af475191649842f3a4cb286bc042a96df7468ffd676e7b6de7372caec69afd0. 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/NLAM42100113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0019c44d348b84c3ba96c57ff9d4f951d24cf85e9fa323027161b79b2d609c09. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/QZDA62181140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8743e66ebd4b6638d0e6e407d51094298730af495fb406e33a3bda58c9256db5. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZHN52057558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x959b3da944ca27889014397c18c46adebdf03547b99bc3ca0df06b7c02dc50a3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAES2077837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb667d7a6ea155fbd1b7e48fdbb8914d6d4c8c39926272eea5f759af9f80e368. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZFYZ2086837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a323af3635be3c05a7cf9ab086856022281289f31702e8f04b711ab97acd975. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZFYY2088036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5e3462874bac5694fde96e2c79b336cb5a148dee263aabd99e2921f944df222. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZK6Q1987297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8c416fb71ceca8f94f8645a21d4c4b207c292d791568d394c854b1a279c5bb8. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAEN1920862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44cfd1f2d98f90f68ecc8ad3294b17cbdbeedbdb6a81cdd350f852ba2b93b566. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZFZ21929084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d544e802b0a9f1ef4caa74f630ce62a6836e94dc2b42c4a8eb1a5be4e076ff5. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZFYZ1900029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03deb8563a57d52e4c0bc10fbe130e8286b97cd58133606ea12ff982c8eb863a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZFYW1935292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafc921995de8b56d92c7dd7594ec91d5344350dff306f161dd0d645825f28a32. 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/QZDA81999635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43e913049bba1ac38b4c80c21d1a5bf5db137542cae617b15638ee69debc7a64. 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/QZDA71815573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcacccecf23426e175fe675cb7dec95b0c8afdd2fcedaf7b87affd1af3e1c559b. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NLPM11826845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x809347e1fe9e64752ec696beaf4e3c208b74a84e2f54f5fae30e1a85e978e119. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/CAHQJ2556543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c023ae8c93c728cbea11522add8c62fde1d39616def9c089b32726a1bf47b57. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/CBF8B2444717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf875a971562a0dbe3e03c8b02d88d27ca5a46f2a5c022d4dc93d39fea28e30e5. 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/NL8RL2444515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0d0e3a8220a5bbd63776b9f71c3032faa5f00bde74e56816b1e9da012ebb562. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/NL8RL2436672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53860021a8004c2dd85a4291dbfcb1b76466be32376ec9712ea72b9fc0638113. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/NL8RL2436671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3743732b7616eafe8cd1d4a4e4de6b89f49a9e58664ac6266989d5b502a91203. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NL8RL2504861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74293743ec901b29f8a4a01fa7e5ca71985559edda51fa76abebd04c9db44005. 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/QZDA81946339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4359fa522ff3a7d1904b79027f7fc82dc9ae7d254092b7045afd2a4ccd58b3c. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZDA51959238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0792e12adc64d2a34da822555d5d07a216074399d75d1d3d5c5dda0dae01d76. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QZDA81946341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x487d574c177879fac41e305f71ac48fc5f66769bde7a19015ee2bd4186a5ede4. 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/QZES81813215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72151e9acdf7c9b45ce48965d19a7f049ca4d5c7a43abc3eade5ee7d54926ed9. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZDA81946342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e71e32762c1cb56d53fad1f2f74fde8cfe4e6f9d857ff4fb82c48d64ee84caa. 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/QZHNB2044677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf997715af90ad2500c7ff51a32634050cfc04f4a91073dd53b310eb2b261ee83. 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/QZTB32443150.