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 0x67eda8c4cd6489ed3e5c78129972d6c0a0dc47d09b30fd38c4d8f42e1efe8bfa. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d3a46265-0719-4223-9b1b-2e7b1d11fe1f.json and https://artists.proofprofile.net/proofs/artist/d3a46265-0719-4223-9b1b-2e7b1d11fe1f.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 0x6fc1d19976a4e901ca1d0afeea5e5af7ad2311185459e39b860f1fbe432ab185. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZHN62580855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf44db6a6e6fcf79ea0d79709b6a3a9759529f003fbacae9977f37a0703066f98. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QT3F62503543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d516bc397c8eb09d35ffe5c08f5f792dca7b6b1b7c6aab30543f2decfd6b6e8. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/QZFZ42348535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe42ba6df1da57cf44d8979358bf1c394bd953cc1bc1545b1b531e25c9b523e33. 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/QZFZ42348542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x557ae8cac23a8f161347b20e7b4a1221a8b67a3c559fbb81f56ad93c8079b150. 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/QZES72408167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6ea2b171a3fa28b7631658f508764d0fa17b481cb2ea397384e331668841369. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/USHM92419293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd43adb5ac5c3b0042d7f2cf92dd7b78396e51bff7883fbc18e82f0482cca0384. 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/USHM92419294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5c83e6a5d9c317fd33bb264b37da721a62d0ab04ea055cc6d757c3af3c01792. 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/USHM92419295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6800ecc51171810e1a4c30b8273f5d8cc889ec30aeae6c9bc89a235c357c3c5. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/USHM92419296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7e6c0914d94bc3a7596ced90179c52e44d163f8d0f020253f52b34516f0a060. 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/USHM92419297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa10882a07c9287ac229ba8907d90c96e4e69d29e3f1ef96672743fe37f70aa5e. 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/USHM92419298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d516bc397c8eb09d35ffe5c08f5f792dca7b6b1b7c6aab30543f2decfd6b6e8. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZFZ42348535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd62b8a78829be62aab46af5ba80ba6de00b3e349902e11fc7519b645ff04ede2. 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/DEZC62466759.