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 0x782a60bfac20bbbca9c60442bab9b6be77f099eb28bfc83b0c8c21279b18b12e. 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/b545d63f-a2db-4fb6-bd03-f82b4c5c5ef4.json and https://artists.proofprofile.net/proofs/artist/b545d63f-a2db-4fb6-bd03-f82b4c5c5ef4.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 0xb3b99d46779709c5621e2baff3d04acaa01f5fa52bfd16d838c4e01ad8c348a3. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZFYW1913718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcce4bc68521c0f9e1add0b4e897a696484241a0bc836b6ef7e90a9b3df78de6f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZFYW1913719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x404d5a71f12bc8dcf4aea1e2d03c7d6a4f8116e21b44eaa76e5b12f5daf3870e. Chain 2 (Bitcoin): anchored in block 960155 (2026-07-29T22:13:32Z), 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/QZFYW1913720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcedab19772bbe2389c165dd0bc1539fcac5de1512379407a150d5d656b2480a5. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZFYW1913721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa45df6f7764c7d0963aa295eaf47ec68805ba142bd1d25a8d461fdd5a742395. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZFYW1913722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38304e5467e9922b95b6412652930e10d37a9a555717d98ce87d03e0000e699f. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZFYW1913723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b56438ee90c35991eb3e27c8a3778989939263319ae28aea74ad279cce2ee18. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZFYW1913724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1d58812430c2c577a09fba32df576904abff25e49cbb1505369e83e0d836c9f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZFYW1913725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c666578f7a4cc221ff4390f5039565836453e2a4e4fbc13d27b4d266aa7e163. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZFYW1913726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58bcbb089e956fd2520ead28d63c725f62a616e9fb62faab2c7df6f2f1ed001. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/QZFYW1913727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f75d1487f8dd012b9dd0e4667cbcb180a9ca1ad0a9fb3490f5c934b712a190c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZFYW1913728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda3c15c193ab257e6039d37262031b409d16dc6fc3a59c379b90adec16528ca1. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZFYW1913729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea90231b0cdab876e3e7571f9a8b5c27c69de3158d4e0fb5d6bc07c611fe2465. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZFYW1913730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x901f1b747270cb7d04eb26ce615389125675b73e5bbbe9318d56476076725e8e. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/EGA252104539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x020db6600f72ddd11b3d6fc1b8f7a21723d9f7f871bd75c3d8edae8ab8ce1031. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZFYW1911695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5917e956e48ac40d1d4b369ae35755ca79a6723a7e17e2ee259cad9abc78f443. 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/EGA252104537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x838747dc773996bc07da5b6a47767f9a30b4e710b42f9dab9eb0798acdc04e81. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), 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/EGA072000472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x254197c6b6ccfb004bc24026bc5ad917a35416a4844e41b74330efdc9d6b2d15. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/EGA252213082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7be88c15566b001113dc53526403884b38b18789a5f5e3cd4dce31a13e0bd035. 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/EGA252306144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5208ec90d7d2b9ec8761000894db6f719b710423596f1c202b98df5e6165357d. 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/EGA252309635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e1e24c37ac21de1f2ee037a753e1744a67880b36c1d02e0b79edfe56182896e. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/EGA252401856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c4806d7df86e59d0415a916aeece4fd4bed43b07c358f530f9c1c930f7f03a. 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/EGA252509134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x958c50298ccbc5e868ebb7a1e2454f3b9ff06dd54a43b707ef93b9441840ee95. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/EGA252511685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x445e9f15aba733fe47efd84729ddbb9af9d0303741865a1a054c5eb420a7203a. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/EGA252514730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce31296dbfea753160b004db071ee963fdefe21a8ab928efda91e9a7af36b28f. 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/EGA252516575.