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 0x0a5174460c001c2132b64dd0be3ab92ebbd7238d49f9406a18e0b0d40016a1e8. 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/0eefe7c4-5b1b-428c-96ca-4512e4debc84.json and https://artists.proofprofile.net/proofs/artist/0eefe7c4-5b1b-428c-96ca-4512e4debc84.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 0x240ab54f731f053967a9b652e228d66479a22b130e40b0400b3303ad35c9b0cd. 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/NOGTA0024070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e8a64ebff908a3d1f93f11aa858015a825d771ad58b663bedb7eb28b956c243. Chain 2 (Bitcoin): anchored in block 959009 (2026-07-21T13:14:47Z), 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/NOGTA0282020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41fbe07eb27a3f4d58512c88d8eb4bab373b358715a2130122d17042a73004f6. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/NOGTA0282100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ed9345e126ffe27dec85b020343c552004467eaaa8bd389027003b76db2814. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/NOGTA0282110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b05884cb99276b94781af9b34fd9e91c31ea2ccafd6e8da8d50424cfa8bb907. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/NOGTA0462070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdf5cd5666d4d21fc9cc8da350c899ab17901b557d57306be1dd4e88e208ea2c. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/NOGTA0462080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe7c9e920917f50567bd18781afcb381d65db7f95e69e1b126c93a593d141f4b. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/NOX9X3292912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74580813a403714106a5cd77361a6c89ee34465ad14ab8e2c3a4a9407474a2d1. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/NOGTA0899020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a9571908b6c47b46f78792f4ea00ec697c34d4a3c32a066773e4527b30d0f7f. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/NOGTA0899040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe182da3a8a0d2ce430a12078b7b365e240c5b9ffa58b12a41381d413af15deee. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/NOGTA0899110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fad25dc95954f368fed84e85cdf0be9d0e6b6a8ae5952d65bed47cd423df510. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/NOX9X3750701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x217e42a07d6722648b05018aa325b042661b767f3a40c8f36b4a8083ae70a5df. 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/NOGTA1203060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07ab20634dbd6055a446dfec0dfb068b59d98a5217757db3a9a13c841cdf678f. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/NOGTA1465070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3c10a89acb5d13f9fe432c957119e9b43acde2fd85fb3dd84d8704b61b2392a. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NOGTA0282040.