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 0x9edeb14bdaf2c6919fb01907870e5bfde2bccfa66dcf43df67658d21b1fdb866. 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/576fb340-b32d-4142-ad6f-722d6c117b52.json and https://artists.proofprofile.net/proofs/artist/576fb340-b32d-4142-ad6f-722d6c117b52.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 0x6fcabfb7d406a6517f1db4e4c91edbac17c5237fd42b140dc8a542c06b5f5a8b. 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/QZES82231123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1bb5a3db9d29d9fee19dfa84b5d48704d41c9382f857a545ac226887a0cb0a8. 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/QZNWV2235693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a8f809f19c16f8217f3cabeaa1582de67e392754ce450e5d44f0e789512ec4f. 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/QZTB32212368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ed6570c976de3c184ec68b7334be84691659d7d72d7f7a2bf6c453d877d97ad. Chain 2 (Bitcoin): anchored in block 957834 (2026-07-13T09:42:16Z), 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/QZFZ22386399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b7d04cff0b2acfae34a28afbbc60829524b493215b0f1a7bdd173d6b4858b5. 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/QZMEP2493813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6c5343db5f64f0ce249f060d81736a1bb6642d6570fb4167b522f23ac9bf26d. 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/QZWFM2318791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x364aa3adbb212de8066ee6f9d6bfe89d6abd5b8c61fdc862de4c680a67fa7336. 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/QZTB92497167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87fa93fbf7d16c046c8b36dc426de6cf850568cd5e435807d22243021f67017a. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZTBD2455765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fb41f585b7e2dfa0c7155e9c3d8efad5eaed3b8f141b78702b5a6a3a0d571fe. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZWFH2485137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94af42f46bb811a6b515bce8ed6e26947c6d4867a995016b6f5a71ab6396844c. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/QZWFL2430762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a61295f515b3bb6d88d139d4424c04de4120693d3a020a8787bf49169849144. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZWFV2487511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8a2d011acf55c2b9ed30701f0777d1c3f2a1da2d4a3a7529e1d06c2fab8a741. 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/QZZ7U2497022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa36c0801843697a147e06edb6fab111373a51a327b1905b98ae83fc8523f9b4b. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QT3F42434324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x742eb3179dfc770365debb0186808703d4ae2a58b0b8543a79a098d2ebd4dd17. 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/QZDA42512116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c83751d842c9b306172db15df79463eb28083aecb93bbc69a64dc8e0b0eb9de. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZDA52573326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18df37a31e24029f090f404210f1e63ed3140f492e8f2b2e59e672ed1359c8a5. 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/QZDA62509653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a530c479cfb9b1c27043d580617f2b0dcfe825acab1b41bc072c57e3d3203dc. 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/QZES52547224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1225d724430360e76c74f4096c50bc2d9f43986ba2ce34adce4d01bc3261e5f. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZES52535584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdde45b305b38f5c96478c8380f7edc297b3df91d5597f3b684f0a648be99ee4. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZES92504122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbff4458b486a9cde2829faa7c5e2317910ff379e4038dcc559ead95ad00affb3. 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/QZHN42540362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x999285966a7bfffcd6cff7ec6684a2990f6c71d7c2e30e5f2811dbb75c27f9a1. 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/QZHN72545826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6be65a03ec4ee74b5e1d14a24b21331afceb42c89c946c3fd1cdd89541c6587c. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZHNA2504346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba055fc79454b5ebd0e72f076971df8f7dfddd15f220ad63c158a3728cb7cdf. 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/QZK6P2504324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8542a7862f198f90ac4e8a0f51f1a833930d1f061285bb144b6bf58068301421. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZTAY2557732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb3b133ec4fe8543c22f12a74f9472bc9b887c4f712a14b6b893eda3d8054dec. Chain 2 (Bitcoin): anchored in block 958647 (2026-07-19T02:36:14Z), 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/QZTB42559918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabac001719a70b83457aee35b52c4ab03c32634367a900dbe462724d277ebe49. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZWFR2529125.