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 0x992fee25051f966d03fa539b042e4a81626ec97b0f4b6a94e3248108875fc09b. 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/8971ab6e-5fc8-4170-b6af-2a475376bea3.json and https://artists.proofprofile.net/proofs/artist/8971ab6e-5fc8-4170-b6af-2a475376bea3.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 0x362ac881679308d21057fc72a37294cfb7b29ed44ce6f7d0cbdbc706a020ee05. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/USUYG1470671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b5d7479f3dcc377e9dc6060eca8f60ad2b3b8484203a519840f467c0fc10ec3. 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/USUYG1475258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb77e29c7ad36104fa4181c218d10500614b7fe3dc511e4f23bc061aa39053ad3. 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/QZK6Q2393139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dba5c8efd814bb2b4ba198af4376fec14a13828c9a7fd0580bc09f52c6f34b4. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/USUYG1488141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8f7bec5abbc904cdca689bcc6c59d128377353955d7d92583fad952259d5330. 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/USUYG1488182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcec6f341bfb829828b0ca8bdbc947ac350d5ef30a3112a9e5177b128f3619aa0. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZNWZ2319970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x881919d4b929338fb8fa6182d3168706143094eb69574f5bf7a89d77d5eb4011. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZK6F2304194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb77e29c7ad36104fa4181c218d10500614b7fe3dc511e4f23bc061aa39053ad3. 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/QZK6Q2393139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x344b5ec4aadad5999efbd81be86972caab8523dacc973da8a3c4089618bce84a. 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/QZNWZ2319971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0164560940a05a6c09d8e3c194b1ddd8063b1d0ded1db237b6e56cea50db1e20. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZNWZ2319973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e714513fdcb2a3878e6b7565415b8aca842f8d844a35aa076a14b193cfd9d12. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/QZTBE2334466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ed615854ad9b124ba81a866b2613adb7f510cc8806764daa0aa96868df95c67. 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/QZWFJ2365439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc487bfa49cbcdedb83a1269ad37d59b49e01635db4d71c23fd58b8b57b609663. 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/USUYG1538437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe64f1a8d4d767f8c4d6b0194c50700de084154235465643e1972029de08e9b6b. 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/USUYG1575493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3457fefd7185dec6173c6da34e6efda37ce370cbe4dec0fcf963283d2cc77cd1. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/USUYG1575369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x270ece01bedc67c75442ff358cf6ba632f64920edb60c0814e58f0a27f17c659. 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/USUYG1733583.