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 0x541153c377d02eb35ebbbf884e7a417395fb1c186f1c830b5fcd28a4dc7e035a. 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/d04f974d-142a-47d2-80ab-93e0a6621081.json and https://artists.proofprofile.net/proofs/artist/d04f974d-142a-47d2-80ab-93e0a6621081.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 0x2d958763a9ff273ef1a3590f28e94ba3f02a09f2744d464d9f971ebc97db2460. 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/QZHNA2215175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3edf6322f24acfaef9e365a3fe8406247f0d4f2b6201e5cd632cc23f1a1514b0. 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/QZHNA2215177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92f76275ca988acd1314f1374c217fc59d0ad1076533fad0743dbe066b801b39. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/QZES82398969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a5ad8d38a1fd6f9d520b03c3844b22b2ee5ce293d9bc5a5193e63c3147c2444. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZNWT2322774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4ad1172ec6812c9dd4ed6615653939ac7745358ad26d52e60ecd1a8ecb165c4. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZK6M2422700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8a2db9648b18bac104bd66e1fc5953054150d390d985a46734185eda0436d3. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZNWS2498868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x681a442303912e2ffccd04dd872a7d07b9beb03137e858f72f923ae1d421edf3. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/TLVEM2457529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf24a6e78fe5913de59a14e62ab70463aee6d5b65b127248361f2a61039fb3889. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QT2VB2469955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x149c7a7a0d8da5186483b61d89031f8a0e5bd6f4a11039516376780f87ad26a3. 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/QZPEW2512749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4ad1172ec6812c9dd4ed6615653939ac7745358ad26d52e60ecd1a8ecb165c4. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZK6M2422700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cffe9a87819c70a2f8675d70723ff437fff5712ae0cb2a27cdc6715d7776c16. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZPEW2524598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e593c4d3861394d90717028d1ac41c3f72efe35ee96d7207dd32a433501bb8. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/QZPEW2521573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9afe3e06cd29a0490344d03ae2a9e954e3d7a16d892d305733b212337dedae49. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/QZPEW2544910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0de59257873cf020d665b9cb2653aa8c88865720f4467d350c8b29d752e37809. 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/QZPEW2544909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf24a6e78fe5913de59a14e62ab70463aee6d5b65b127248361f2a61039fb3889. 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/QT2VB2469955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dee390c9f8cb8f5257920377e5278358fc56ea7e41765b6e5f8695a95dbf9b7. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/QZPEW2542717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40a8555e79b4134bda0dc4e1e10d3c5b66286079b3dd87cef9b10b301d517049. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QT4K52504069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34475f8e6e3e519f051acdc6740ba7b22138b26ccf45ffb037bbe356e128830a. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QT4K52530961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6013015a8a4925df4d1a05428ae6dc18fe23e1fdcecddffb9318bd42fc05486. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QT4K42512804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb791640d846b8dde1562f3f27d592d3c04290dc5c1a7a9d770ca2e11b46a359. 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/QT4K52595830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c36ea4e8337888d387c672b4a1bbd989f097fba41546aa994b4b7428e1f03f1. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QT4K52569864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe32afe03440bf75e6f5fa9f6d7bb9e6978ea2a34e51a35feb0489ba54ac986da. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QT4K52553781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34475f8e6e3e519f051acdc6740ba7b22138b26ccf45ffb037bbe356e128830a. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QT4K52530961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40a8555e79b4134bda0dc4e1e10d3c5b66286079b3dd87cef9b10b301d517049. 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/QT4K52504069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40a8555e79b4134bda0dc4e1e10d3c5b66286079b3dd87cef9b10b301d517049. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/QT4K52504069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34475f8e6e3e519f051acdc6740ba7b22138b26ccf45ffb037bbe356e128830a. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QT4K52530961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe32afe03440bf75e6f5fa9f6d7bb9e6978ea2a34e51a35feb0489ba54ac986da. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QT4K52553781.