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 0xfcaba75a8b4ccfa4512fefce70337731b721ccc0b52b0948d32dcdb9ba8ba5de. 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/edf3b7e5-4b18-4824-be38-58827256b981.json and https://artists.proofprofile.net/proofs/artist/edf3b7e5-4b18-4824-be38-58827256b981.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 0x728bd4d9874fe1f2fcc2f213cc85be5365aaeb4da0e515bd67bcace1806b3181. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZNJZ2330493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5de9a6e62067aba86bbf0a1598ad8ce58502a3ee522a3da45d28cd8aba5e7eef. 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/QZNJW2161422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16f8fbdc1ea8bfc9540c83dd51d8564f4cc3b0a20959480fb95ed50b835be31f. 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/QZNJW2161423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16afc908e18cfbb4980ff2741a7daa295940ed890cdaba7989a17fc5916e7e5a. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZNJW2161425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8352702ae4ef9f7a5ec8aaf3edf08bb36dcb87de2ae17379d11d2f4b593c03a. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZNJW2161426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d18aca981931f4fd475650c398a631188e6da6cb2e1c9ca3d2d2d2242142dae. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/QZNJZ2332631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c3bdd69335466c1e09cc1fe4def780f94a2cbac3aa7ade68a8e5a515959a3a8. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTPX2284040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7d2ed71403bc36da77ed4e1c3289f3ec22ae7276d032c350cb84e683ec8befa. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZGLM2304281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8e7c636d2c7d6d9f6b1401f713c114dd6eb2381d74176504cdd9eaa6628b938. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZGLM2301800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa371717912932105e9ca6a69487e9b909c49f6d90cc84072fbf33f1e55dc3ab7. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZNJZ2354608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4ab73a356a0341d0c1fc5776f6582ea221c973b8708412f9b65bc03f4aa386c. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZW9L2377778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94a8c7643be6e9d9acd99168dfda879774d3e4791db5ac7be5a22b0fe4ee0867. 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/QZGLM2498057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7793d6a7df6ddf8375a91d12dfe1979fe76fa24374fe71f15c31c1d084faacad. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZNJZ2596192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8fc37f43abd94c90cbbcbf41593436891b7371a725ab211bf69c7c7ed0549f2. 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/QZTPX2579052.