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 0xa8faadadeac9e32d84ca95e6cac456e56773fa52d320316d3b220c92ff26b757. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/81be1096-8cd4-4cca-ac96-f983e1884458.json and https://artists.proofprofile.net/proofs/artist/81be1096-8cd4-4cca-ac96-f983e1884458.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 0x69f8ec13f9758e07ffbf2e6cf2dcf6a65b30dc986689ffeeb41c4a28bcee385e. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/DGA0Q2342501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20218f302e45da0ff71624e7326b8ad5512a6f043e4bdd1ab653ea1195e9e224. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DGA0Q2348165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d5bc747bb8803322bc0c4b406c91d1925d6fa334dfeb676f8fe37f7c7a7fa7f. 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/DGA0H2303595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb792355bb5a7be8001393f104b7747db18c03ed25cf6057732381b096db6ae54. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DGA092360115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01a1ed0bc013fa9c56a705309f572ab5ee037f7cbcbd2ffdcd10cc4f533f0c5. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DGA082317374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd84d5853e6553607beb09526fd431df46912bc24bd3c2d045c9f1d58b68cde31. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/DGA072345773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09fd040181ff8949dc85c73bef6c33707fac247a5419156d49c1a262222a274b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DGA072362339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d60d72300ff665941b7bd1483e09bc5473f813593c903a037ee743f0677a76a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DGA072304611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdf849981a86d0d61346d5abf9422c1a6c27aca908eb6b590d44a871e9577a39. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/FRX762313850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f5a19ad1a979fd81bf34335f514c8d7a4d95abcaaef5e583fd9a6a4d030426. 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/FRX202337151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad038885f2260c712a2cfa34d006aae5cdd45e11895f5a24cea1b8515f870370. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/FR96X2363582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e6b920af8935763faa36172e71a91fcbee832e56514db5cb9977e051a9839e7. 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/FR2X42363888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a23ddfc17199a779da8809e8adea06e5ec3af88cff56f7211f37d672eeeb81b. 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/HKG732107066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed9d084f57d6ce37af0a2708ce7f250372105ac52cf6998f1f844b7ca228302a. 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/HKG731901784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ed15c0340fba333508ee4be57a8dd3849c32d07b17207648bf57eb71d539481. 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/DGA0S2484929.