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 0xd39295c1c4e3a43085be98f8f95027db79a7b0aa5deca02b7f29eade6c12658e. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9db91a3e-e195-443f-9fbb-b8bc91bb96bf.json and https://artists.proofprofile.net/proofs/artist/9db91a3e-e195-443f-9fbb-b8bc91bb96bf.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 0x0866347660d275e751e95e0f7f5c9137a4a71f3297b781ebb9573a29649a6c39. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZTLA2438468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13f0030a3c0281adfadfa5061eee2c32cd2e112da13f96958d1710a2e56e97d2. 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/QZQAY2487744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7ca20a2f627b79c296904e95ec77fad8eef9742304e864c287dcf2277c94820. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZTB32305567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19550f476815161459dfb5e238dac27f2213ebdd964b903e395f5cb3041acf81. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/QZTAY2332782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70660ecb721f2b8aeff6240131599928f6e8a5f48f3fb8ac561808722d8692ab. 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/QZTAY2330585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1d7f87a3b313cdc9adf335e23851e14a30f3eb918bc5a81debdbd7b64eb0912. 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/QZTAY2332771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7980cedb56ffa351cc6d02e0c65473868c499c881917fe30f7ab6c79d3418ff. 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/QZTAY2330638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f75777963da1569ef4b4555f6cae50d19fd135ead6bf264b1f4cb665c7a1039. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QZTAY2332775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3f33aae4b7ff09be0f3033b920f1cea2ca2c7b9cf22ec9a9438df5d0fd6e870. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZTAY2332776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cc4e307d3078e46d0dcdc365d54d075f07e0692cefede8c9039f06f308c1920. 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/QZTAY2332789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b3d24a02e522a39f5eb7aeb9d85c184c7d523872650ead14f2dbe8d1678690d. 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/QZTAY2332773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a831bc8c6d44b51620c194b4b500e7c1117b53921a5ad42f050fd7b14c8644. 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/QZTAY2332774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213986c7e3c622ca678108513d5580b93d32841153e663a3a386e32ce392e007. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZTAY2332778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37cca6a1a754a7003b929f4abb28d7585bbe59ff68dfa27968eee2e5952e1efe. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZTAY2332779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05a3ac61525cb3280ea8110ef8a62a9748726f47c21dcad49d0407c4baff662c. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZTAY2332783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07c6b469cc87b7948c410f0ccd3a6a2d6ea02ca2dadcc79e31c3eac93aae40cf. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZTAY2332790.