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 0x8caeda22d87bd2c84893e1eeda0f452a1d136cbe20462bd7e667a2733944f9ee. 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/144de827-1ae7-41a9-afd1-1dd24846c483.json and https://artists.proofprofile.net/proofs/artist/144de827-1ae7-41a9-afd1-1dd24846c483.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 0xf67d4e9d573dc3d554b4138fcbe663211142ddf8f5699476446baad155a96a8b. 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/QZTB22434067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89b32f24cc45add75b2d5acc7deb61460c370b5b28419b5da19bda3c7d10928f. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZTB22434069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58ed2fc2f5b323ed966358257fc7109963667e09312f5944d8d84cad4a52c73e. 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/QZTB22434068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e89303c64eef770ef0ff7bdfbd87c0cff4b8d9d9fb1ada5e8fd761425205a6e. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZTB22434070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d89e82de745a4f81b31e70d59e8a0b50d5fed9124b7e5d537a65f432a768c81. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZTB22434071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e4a2217d82ba3530f2fb92c8fea52e3993aa9806b33694fb3b4074408fab151. 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/QZNWR2546546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x768c43d847f00c1ea6c410029f7dcff8d683a8b10da4e54323bbfcac4121b43f. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/QZNWR2546547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe8918ada56bfac3f7b5cd61983186c7341e61871a32d3aa7459fa812eaed03. 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/QZNWR2546548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f95096260d14a42327a5352411160ad1ef3645e9a9cc0a22a615f0aeb66514. 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/QZNWR2546550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bb8c74176fe4e7ccf3c907ff9b409a24bbd48728288a3e9a6c793e470d82fa6. 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/QZNWR2546551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd19085b37bb6c33963565e865ff3b724a286a223fbc3d53b8645b93c2ff1ae1b. 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/QZNWR2546553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x916e7d2be5442d590af42fd99e8cb90b44a03527ef522046b7719ff970de540f. 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/QZNWR2546554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb53ca92fda224b9489aa177f429696e817c2c11e98c8839ff24ab0696cdb30d. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/QZNWR2546555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf8f888809d76c634e0ee8be2df46a8a35fc60bad3bb3de21c0da4821e333569. 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/QZNWR2546556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11af4a34fa614a2b31b72b869deaeaff02ba1f1a3ed7d9e4de0fb4cf3012ada2. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZNWR2546557.