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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 0x84f70ebf9a8e33c8f892f4ac4accb17aaef75c01cf27200a37a9882806b462f7. 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/03e36abf-b106-4ddd-84a1-9ebaf70bc569.json and https://artists.proofprofile.net/proofs/artist/03e36abf-b106-4ddd-84a1-9ebaf70bc569.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 0x3abfd2161f253f9a020183cc65927b3a2319bf119a3523320215f6d878aff10b. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/GBKQU1580493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12fa805b4c9044bb1da3f415dd0cfd7456ed2f2b271be3d676b2a8faba3edea6. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GBKQU1580495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af9e9327964f1f0597db900cc27444c5f6ce2654102400eda801d29031d0e21. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/GBKQU1580498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbede3d0e8ce3ea4ef146aa81a55d1b5b445046ee02392fa7e404466ebf31c03. 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/GBKQU1580500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4bee4125d2cc7f9b923ae52fa168c3be1f2fc3aebc43cb212ca50d0ee51b1e3. 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/GBKQU1879938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a7788a0b840631550facc4b64341c3bf7a6c7036ed69336665d460a559f85cf. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GBKQU1879942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77a7fc5fbc259836b43ee25f322494b019868d6555cd285567c93fa92ff122c0. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/GBKQU1879943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf93feb35fc1071cad5623590aca4c99e17d17eb200f93e11564dbe48e7275043. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/GBKQU1879944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc38ae9616f2feb8c27cef559d8d35976d00e16bfc25e67c79f310ce2f4436393. 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/QZES52098897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b47ad380369910d9163d4d2729892063bced2a74d01f15b1787f0572170e35d. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZMEN2011676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6f4ab885a66cc9b18f4865622f97b09988465751fe7dad77816fb9ccc7640f2. 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/QZHNA2146252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x951d348b44d3f3a2e93b7a2523a2aebf7c216f25873113d996369a3a3ca9aaf8. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/QZK6G2180853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7ee27729642a0fce7e63dbb422c479f2a34cf5399e96b0b39b81964b25fc022. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/QZK6G2180854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2eed230e486089054bf26a0532acd9f3e63eafc435dce08423100bc394996da. 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/QZK6G2180855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d0cd354b4b43cf3ebe742c20d2c80887600045dfb2bb250275342ebef74c2c3. 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/QZK6G2180856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x547d100f1cdfc04b6c60997723107453083be5b9718335fcb042ba3c889652c7. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZK6G2180858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d2b369e957624a7b00e26504f39cf46fa9062ac86f8df60f09d96ebb616f65. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZK6G2180859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51680c00fe630cd6e7aad046d7b842d5f1991491b3b2658b041510fe8c549518. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QZK6G2180861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9788e3e05b15bc09311d29e035600c936fb93b588feaa8fd4d5083c4c5e58eee. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZPLR2139987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30862180e451b2c252e2e91c87e7c0b0588a08d681c7c6ccbb9f6a4516739fbd. 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/QZFZ32284448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18403bd3bcb2e9b6eb414d7d017f53803ea02a025e448a5b97f576a13017e62e. 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/QZHN52380587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2cbba5792ee387652678dc92cee0acaea6f2e96c40ac7b43534a9e0692decf6. 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/QZK6K2567624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba737a7b10cd99af9b903fc98a5f128cd0d09759918a8dd0efbbbb9af10d7def. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZK6K2567625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaadfe35c60816035a82e0ea40706a0d1d46e20104a5272611b2a5665c793d2d1. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZK6K2567626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdcce4988e73898f6c7bde457ae3ac50b268c73b14a5f31ccc6484cec9e63a3e. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/QZK6K2567627.