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 0x87fb1e65e2d72e82372fabf00cb272f666d377c16379767dc61f310e7819f128. 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/1bf1b4ba-2991-40f8-8d48-d3a4f1b2c359.json and https://artists.proofprofile.net/proofs/artist/1bf1b4ba-2991-40f8-8d48-d3a4f1b2c359.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 0x31113a308dcba68538317c86b1235036fff610948e96105156fda004567fcac1. 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/QMDA71521393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dac05515afac0ceb9c3e0e6a49d395b18beb06e69dcceab9cdb7ae0c92bf83f. 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/QMDA71521395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc883b489ab4d69ae2e229a47ce6bb6a12b6b8367669008b1fd20e6f8c9c007de. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QMDA71521396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x259dd662b4ce8018a1d36a10b1a88b8dd3d3ff6236ae58e7df66bbc132f5acaa. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QMDA71521398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e4952a49e4b8f267185b9e1185e58a650993f23ec4b266b7394b1f87a5844b4. 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/QMDA71521399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45a176a3c47ec0e2231cd4641e7883c82f83113bca06fe46b0e71c87513b4f30. 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/QMDA71521401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64b18e8873b51020af8da98a75030c4fad671c805e3d903bd70ad2542f129a84. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QMDA71521402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41c61c82ba4661f542296626f43eadf9dd70ed07c5180cce9bbf3d1f1ad103de. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QMDA71521405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ec71853494b027edf8d54c90bce4f304ea67ec0f27ff3bdb3e959fc2fea5186. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QMDA71521406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc78c1f0d4cdb0bf8bd84fb43438ebc49f6dda2ab879ee9fa52b380ccc3162e35. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/QMDA71521378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9c918046f126717d668baf6dbae73078aa519cebf9b3f27985050f11ba6adf4. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QMDA71521340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f4e4136683db279610ceb984ac0d254c90c4f3d341d27db4a79aca228aeb93. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QMDA71521325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b3656b690007b16b3b446b228243aa24e59031ca27b964f515fa23218711ff6. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QMDA71521329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dc11d3add9c69db03f8ffd49ecd90e71f868126fe70bcd5d862f590ae8c59f9. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QMDA71521318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8459b4d5fa82cde42de0ff517fc2c75034a0338695febea5122c07a2eb411479. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QMDA71521256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0031f57fe70acea81c78ebae02045051cc55ac77fbecf89063c13ab7ea1df251. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/QMDA61317238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e0b586d1e8aee6d03acae42f6001734467e771431e445d23313e9403a17dcbc. 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/QMDA61317244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec5dca24bec4f1a1767407612ae46d2118ac255459c31a90c3ceb13f7ff9cbfe. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QMDA61317247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x295b70945965db1b877aa6de058cc495adfdb97ad5b0155fe59ae9cebd385ddc. 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/QMDA61317249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b06297be8544069e99949120256d525edcb409452d6e70d77929b5bb9100a44. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QMDA61317251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd178261df439c9a63df30883971f48e0e823da6a77533b69eca04426b3f8d88a. 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/QMDA61317253.