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 0x0346e166ad5e75bb38c2b143b0350bc5bf13aa7c89b2250304654a4f9f1e45f5. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e9993da1-ac5e-44e7-9d1b-7a14c53c5723.json and https://artists.proofprofile.net/proofs/artist/e9993da1-ac5e-44e7-9d1b-7a14c53c5723.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 0x79f02ad115a37d983c62708c6f0acdc97c834030453767fb450bc022c4c4f496. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QZTAW2404544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dcb99ed9dc7e392befa00290ed09148a2163426fa0e3648afe3761e7877b95c. Chain 2 (Bitcoin): anchored in block 958399 (2026-07-17T10:39:51Z), 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/QZTAW2469955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e6641d4d308f5b783a7a445ce4558f37e56e6868b8f5f0feddd50eacd8e187e. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QZTAT2455795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d46541c805337be3873b859116b772a308d213ae312f63928bb30d3d65d3fad. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZTAW2467832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9324df9e15984eb95f1be9c8c7d7c7c6b632afa2fc57f213f7b9a8762924705. 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/QZWFS2420260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2543e61a0e6408b0810b1187d23ba481ee25c4913c0b221ea8a0365ccec5ffdd. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZWFS2421842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaee802d9abf47fcbd6f246b43bc81485188ebd0dcaa17a43fac7e1312ae6152. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QZZ7P2452959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb154c920b5cedbdd898c13ff9849cb773dd566256fb8c0cbda01afd6aed92345. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/QZDA52573397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90053c26d6d5341fe74b4fabb0fe55077140330dfb0536fe5c3f9c2028ba19c1. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZDA52573389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4605bd133702a86e5e5009bdb41331eb2b907b8cbc717be5b2edae22f40a0323. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZDA52573410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5cf79750fd3706781c8175b9e7b6aa787910160a71e116401d40b59fed9f71a. 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/QZDA52571496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x146ea8270db2a5441059043df935f1225192474b2e25280fa98655645a54d0ef. 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/QZDA52573417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x310c9edc23693cc2c1b48465f497d92e13af8f2c8083fd8c66229142a27fc72a. 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/QZDA52573399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46ba3d8383b3692b742f305b1b76fd07bfd01919750c566861713a0827af90f2. 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/QZDA52571490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd722784d0b44fb77d6d2c85ee47b845d67125e6908b7144a0ef590d2e409cf1. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QZDA52573408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x866dfe1f2a27aa3840906dfd84c7c1c41091bb8503df34c475db71ccacac9e29. 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/QZHN32568044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519ba16c6f85821b9249e6cb66517e6c640408c0abf6ada9dc181ae582fecde9. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTAT2566783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39712d3117f645f693d25b5b763627694263760f348ccde26e916883e1f6aee4. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QZTAT2569533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac55ec20d12fe202aa5f0ae8334daf58c433c8a61ed061043a59249652c40565. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZTB22591599.