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 0xc2c7cbe38666bba962373f3df06c41a7ba1d8a5d0889269408e3079a0bc11f9e. Chain 2 (Bitcoin): anchored in block 954013 (2026-06-16T22:27:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/33d5934d-e794-46cb-9a85-93b6723cfee8.json and https://artists.proofprofile.net/proofs/artist/33d5934d-e794-46cb-9a85-93b6723cfee8.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 0x5856b281e14ca9424d2afa82e458b5bf9cf4a7870056854687de15ab390dbd40. 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/BK4DA2215206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafd454566266403ab460a70cc5cb12c85d821a4c79e6f450d29ff16fc3bd5d5f. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ZZOPM2231257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe34111fd41b13843e58f3009a5b6e6c87012fa4db4aa45ad2c96e794c1876498. 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/BK4DA2302124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a0d0174a5533843178122b69e331cd505bf991d58895b7abd9695034d6bd229. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BK4DA2301208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x351667f5be5a06867f162607eca53c9d3db624d781868c27ba16ef1107e36626. 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/BK4DA2406437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff5b1386ae6cf2dd384939288fc49e4ef9348c7c17fbb3583e500414ef336bf1. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/BK4DA2300841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5856b281e14ca9424d2afa82e458b5bf9cf4a7870056854687de15ab390dbd40. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/BK4DA2215206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b709b55c3e77bc254bb3a82c6c4fc3d09f82fa400e4a276a24c23bee1959eb. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QM4TX2149558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bcb63b964da752bbc4c9f299be9318e080a8aed30dc3e42765ed7877e22d157. 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/QM4TX2288401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1290f7fa39538d5303c004c392173430b11e82b98e9c3606abc5ea23e554592. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QM4TX2288402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe21b30b6f78568c10efb9df56c4f3a7a95340837d208335e7d3bec2829d8f0c1. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QM4TX2288403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa5cd9d84dd79ad766039ef9332e9d62da8c034eef0f3f2194cec6ab26782834. 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/QM4TW2234137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bdab9c2162cc5d86c67743084c99eb184220e2119a38d1135cb2dcf7f5556f0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QM4TW2282255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3bbbfca93d21e59b66e147448542a281ee6092ac3bb96d2bce6a9c52af2a1b4. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QM4TX2288404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0df303a1d7e8f14d98768a688dd935c69a84cbb5b9c6651f78fe224f0676896. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QM4TX2288405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6bf1ab780778ad878ea330dd15bcbbdda4272db93f0f6d2f7bfe3c1560b42a3. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/QM4TX2263640.