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 0x09273a6ac115684332c643ceda242ca0c21e656cac3f87c93d4ebe1d977c1675. 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/12270e5e-6ce3-4e94-bbed-968e5ba2175e.json and https://artists.proofprofile.net/proofs/artist/12270e5e-6ce3-4e94-bbed-968e5ba2175e.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 0x1ac1490a81ef5277244f32c2686302223376e81bfead2d91f6399b5977bba21f. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DEZC62113723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c30feae14cddf382e182074434a78b515379b4fa6cd558504eaa9f8dfe84fa6. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/DEZC62120906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaee3cfc07c449f2fa675d492c37fb871c507aaf50d9e290b446ba440eed7929. 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/DEZC62139529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x352fb9b4359c1c239edde09107755d3089757cf86fb0d2f02c31b969db92d849. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/DEZC62262345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1755dd2f2eb14d7f651aea7767718b1ee7f271239853cd79f7c19623ccfee447. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/DEZC62295597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b4d1ddc4550e4000029ca9f484765ac89ab7f6a622e18166a1916b698e8d4e7. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/DEZC62209920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2bfb2dc8b6fd32e8651c1cfe5b4de03356ce4b1b995877ca54e353e7c819621. Chain 2 (Bitcoin): anchored in block 958498 (2026-07-18T04:54:58Z), 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/DEZC62215549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06ebb1791ec15054efb1ddbee1da360b4faf1c41b10c79aeef29b37cc247a91a. 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/DEZC62330419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00e4b62f5391e33ee4c2a60fa1f745d2f659668113d0463942b525a48f963b0b. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/DEZC62339404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3142ff5febec2fb1391ebc58caa2ca2b8634ee3fc64243c39542c6aa8359f09. 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/DEZC62333785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60fd0414484ccc507aa0ba84fac58147356de961ac0ec7c617db42c5e2234f34. Chain 2 (Bitcoin): anchored in block 956430 (2026-07-03T02:22:42Z), 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/DE10G2500019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bf72b53a97e989cae58b18042a00a2720e2592913d248c3439d507a31d78b42. 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/DE10G2500020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd8d9e32ccb2399972fc1bcb6aba2596928cf009004bde1628912e699844a0e2. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/DE10G2500023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ee7da27a8c5d97528c6ba24dc4be06d2c598089f0edede70af6b98e0941060b. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/DEQ022110811.