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 0xd8ce3770ae97263dd21b92943f714269ba61b5e3651bbe2e1cc81f4f2e4bf0c3. 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/05dfe436-ca5d-4ae7-a310-c4f8a0600214.json and https://artists.proofprofile.net/proofs/artist/05dfe436-ca5d-4ae7-a310-c4f8a0600214.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x5f916fc0d23ae3520286d0962d0b57117b91c2772e09e60fa7ae475ffeec718d. 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/ITRZE1907301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bafd0efd1fd44aac2832c12fc1fbded58ca285af4a076082d3660ce57f14d47. 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/QZFYZ1977101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5df8ac8b9c037f14315b0c0dc8dc71cf0aa86e9ce0f9da294636c6ec7347d05. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/ITRZE2002101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88e7f0494734e023816dd55b765871f44e4d8df85bc6898f77d3d19bb8ead606. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/ITRZE2002103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d310f152a56963b609ddd4ac1fb7bb22d52d7f5cecc85a37678d1ab493d9ce4. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/ITRZE2002107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d5c5d7f84c892fd24a467b0da796e3dffc4939d5cf23293f40b11d8a7c604e1. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/ITRZE2002108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e141f493166ba3f556a91d420745f75037caf311a962c4f221e693842adb1e. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/ITRZE1907305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98e0cd99639f070aab6d67b5f254b7627659e8953e5ae143028e7728b40f9b63. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/ITRZE2002109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d5ec553d3089f902998bd6aa1f910654b6e76fd5e4fe312ea391d257a1acbc4. 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/ITRZE2002110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f1e8f0a350efe3bb8e0911772950ec03f42bbf5c056f6de7a5ee175d1bf1bae. 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/QZNRS2003748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf24c240f20696616949d0d6a1a910dbc4bcea8e51db78898b19fa80d67817572. 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/ITRZE2002113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f74a8b0a2e730656fc493b472660d31fb284f08245babe2589f501386e9c781. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/ITRZE2106504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77e8612bbd22c24c97628a91884bc6a39530fe8b5fd19e162172dcbb28777165. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/ITRZE2106505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2e19499135123901da1a15f93601e24afe08cccb7e3671b8d3bc6cced64f96. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/ITM382200233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x084a5941db17fef3cb738e15da6ea8f0fec27add033cd6515e9e950a678fa493. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/ITB002401006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ddaf1474aa57ece9b93afe7d5b7dd46a9e114adc4484197a5d0c39f7a0a4083. 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/ITB002400460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc60f9de912a83451907641de4b6446bb145dd947ee7de366abbe885c82bd8a6a. 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/QZPLR2501142.