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 0xe7d9f7c91d55e2ee99f6dadcec46e7ac6a10e73c2993425f5c5d6b44aa5ce62f. 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/94e20cb7-dd9b-467d-b5cb-308b1be66af9.json and https://artists.proofprofile.net/proofs/artist/94e20cb7-dd9b-467d-b5cb-308b1be66af9.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 0x4f45335e82b89dee87f44c1769cd292fc936628a0e6d87b2e7447e4a096296c1. 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/NLHR22300865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb792599bf379f1354ebe5ff534a4eb935a80ce49899c95656b67682471ac59d. 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/USA2P2354199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c8b3b2d6799ac80cc03ba35054f0a2f2c884bb56bcda6ab61f49b637d5e304e. 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/NLHR22300951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fdf9ee064009c3e1af48e20f73a222e47686feaee645c10202a6d446ded63da. 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/NLHR22400695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06c69ed7f477bbf3eef7d4754039a60b7e3b842e333edb50721513ae10ba648b. Chain 2 (Bitcoin): anchored in block 958625 (2026-07-18T23:11:57Z), 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/NLD682402029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e1717d1ed77ca4f3e9bacdfbdd7047446a123aa4fe50815e3032685b3a2b5c. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/UKR6V2485086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19746aa18cb1cd01e6f17cea25d4830c3804f51f3b79fb45c4c9e1bc27f5b67d. 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/UKR6V2485087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58ed29edb7bf95c0f6c22e9ad8db66309ca1c644b89d464a6ab38f005ca3d3d2. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/UKR6V2485288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9f4bb7163e05b4564f1720fcd2155d10bdac0bf027698838a742448e6d3f64f. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/CH3132419393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf4b3047bf286442ce48b7ec28568dcbcf1e5e7da282db47eb31f5d4fae1bfc1. 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/GBLV62415539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x885f17d1f90a2c55afb1eb76556aea4881f7fe6ccb40546f2462b8a420e4c2fc. 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/CH3132419468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8efd0f31321536b7f6fdb0458f3ee4090de8902b9c97e224abae3361defbeee8. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/CH3132419470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b6be076380c47f3813119a5902f43a3686d844fbbb6d32a6371f87818467056. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/GBEWA2306534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea6fa32cd145989898d150fbbbb1fd13a29d0a22009765ced9f957ca292495d8. 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/GBKQU2508484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c522e0f0c6cef7212bbfb6332737698db60d74979d27bdfd2cbbdd3ef714fef. 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/NLD682502411.