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 0x6e2d6d722c2383a84afcbc112c8555117a2ba251d9a84c284b630848f6f87c0a. 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/c51d00fc-4773-4d8e-912c-e1921fa1d0ef.json and https://artists.proofprofile.net/proofs/artist/c51d00fc-4773-4d8e-912c-e1921fa1d0ef.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 0xe8fcc1ea109abb010333d7d1985766a96ab78dbc91434114862c42c7b39f5199. 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/QZFYY1964961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eff5f3f69d70dbb228ac37c65b005d5dad362019668df8a5c0af131ea44df45. 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/QZFZ31972278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60c8d1013014fdac8bf5fc36f04061c5e4bc54370c2f5d7d2172d76201196c03. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZK6P1971172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfef09c139f117f62b9b6b922b5385583cfdce392041f1d6099440a1b580d1629. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZFYY2000923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d6ce88e54512f8bad9a6f83e2323684367b631a829595ef38234daacf41998b. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZFZ72091950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f67c21fc70023eb4848a74dc73088c089ee75cce8bb1c891cac9e548a8b081b. 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/QZDA82032283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6cf80ff3e94d9e00f7b670c03dd732b32918070401f7e10831a7ae4ff2a7ec9. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZK6P2022127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dfda49167d94b759c2445cc225d88af572226f19d7335b320ac8caf5c94356c. 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/QZNWT2043705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a56d96423da34fa1db5f5cb8f505f8449fb7e7942b223880241a25b560397b2. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZFZ42128222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x321b4bc3546ac255fd0c4ae9472aff0a882b40d62826e25a0a6acb65a1deadb3. 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/QZDA82127357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77569194b9a87055657218f3f3a0bffb3d534bf75ef09ccfff2dc029408b61cc. 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/FRX762131404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x974e288a0befc7e132f3085291db45b4559a963c58090bda580270ada014063f. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZES82235144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e396c44f6c662288508e8066756e46f10df2a77c625b05f4c0169ade7d2ce6a. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZHN72298542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e8fbbbc2625daf388bf1d1dcedc2b7d8c63036d7653ae276ef9f4fc46163b65. 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/QZK6H2229085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c682f7063997c384cbbab980626f578527a64be318e542dba2d5e26f9e25a37. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZNWW2292242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa6df2a2a1fb904eb3455e6ee3ce40b0565a4b5c4fd0e9965656a885cdc05b17. 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/TRUM72300544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x718bf75f032cf23a35ab356bc6b9daaf67287bb4b0a4edd8cb3037ee5bc66b8e. 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/TRUM72400596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e7784d77e3b3f21c2ad0f9632d15324e22e4886c65adcf805a8eaf8ff89b527. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/TRUM72300346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e7784d77e3b3f21c2ad0f9632d15324e22e4886c65adcf805a8eaf8ff89b527. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/TRUM72300346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x590c45f80ec4bfc39eea95e4a64f183e293afca1ff5c5e3ca592df622e1d86b8. 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/TRUM72400121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe08f6f32cc289976df62122f8d0aa6293ff8b5c2a845bc7f3f920a88c24c6b52. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/TRUM72300786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab9e68303306ce575ed297053aef3601172d9032711c1ff7880736cf094e17f9. 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/FRX762006309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05d68bcdf8952fdbeed286e44cdcbec880433638c8dd5eb4d861925653dace84. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TRA162400675.