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 0x4b38637fea1207c7f4c85f4c663d79c165f51f6ccb330354a019b8a8570f3757. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7cda4ef5-eb61-4370-a34b-dd2cffc2292c.json and https://artists.proofprofile.net/proofs/artist/7cda4ef5-eb61-4370-a34b-dd2cffc2292c.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 0x4725552ba0e3d9701f4e2321c972e1b525e9b26665245abf38ccc36a0486006a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/IL5841821571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bd6d934a4d97da083fadbe915f17fbdd385694fe97f405a44f9127812c7ac98. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/IL5842343424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x974fee76374d519e3ed46ea2dcb7c191f461fde23c447faa85468a17be8dbcc0. 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/IL5842343355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70c89637fe697e1d22ef0c1619b734e2b05e7f51a74d91f342eaa25169f50598. 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/IL5842443988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb37c07e79f92d972221b7573c41580a8eec20a243325539223d4041b382219c7. 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/IL1012400723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9565216a2fb248400ee2c0389aa40521b22eed7c4da1a5c84a60d0ef09d70cea. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/IL1012402278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c2c7248002722bf87d7e14540b29d6596627cd7800a21b4c745e05e359fac6f. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/IL1012402558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf479f32dda83414e5f7b92765b26ff2ba9e13f406122bcaae609ef44a8d18135. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/IL1012500135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c2c7248002722bf87d7e14540b29d6596627cd7800a21b4c745e05e359fac6f. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/IL1012402558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d949257f541681988f8b80a5b60f2a9f902487bae60506850841ddc2fa50c62. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/IL1012500137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x451d4e78540b7dfb54a85850e0f001f3792f84f23902c16312c4129bfd0493f6. Chain 2 (Bitcoin): anchored in block 957634 (2026-07-12T00:26:43Z), 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/IL5842447832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e22adcb1cbf22f929b047021fe4b3c12817bc5af17423638f3bfd2b9f310104. 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/QZWDW2580879.