CFR may refer to: Biology 23S rRNA (adenine2503-C2,C8)-dimethyltransferase, an enzyme 23S rRNA (adenine2503-C2)-methyltransferase, an enzyme Organizations China Fire and Rescue, China's firef
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 0xa5f151ebc04adbb63dc70b219cd5021103564f96c339ec11cf1bee0c10abf6d1. Chain 2 (Bitcoin): anchored in block 953627 (2026-06-14T11:43:04Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/30411b4d-4b1f-4d7a-a04f-f2971c259c26.json and https://artists.proofprofile.net/proofs/artist/30411b4d-4b1f-4d7a-a04f-f2971c259c26.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 0xff918cda1db9f6b773d34c9e20ec1e46931a54b17cab0d9434e8da48f44941f2. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZCE61801331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8e5370cc1f91dea135332eb100977326a66cbae5a0a256350a699f82d81369c. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZCE61801332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ea713d907b77da0662a260dbbc2d468549bae47adaeeb4b810dfe0d1cd7366. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T18:50:29Z), 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/QZCE61801333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2fce4965a4e8a6cee4225f9113a09b922b921a9acb4a195f1fcef9c6972dc7f. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZCE61801334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca3001628bf2ed2d154c0be98d355265be17a5026070e2a4d83c5c01bdcb340c. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZCE61801336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd0d9dcad6205cadfbf22a9ba6d34ada9f4488e7c78bb187d5a5b2e9d2e21eb0. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZCE61801337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff515c04fc0966975be6177bdc34d8e4629c2a89bd3ac5486301f7d9c4467d26. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/QZCE61801339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cb72ad432a27e6e2ef9e7e02fb386a4d50b13e809806db60a6fdb3685c5499c. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZCE61801340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a049101343918f05b2e09a95661ebbf34d52a595ea424b542b83785113fbf99. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T20:06:44Z), 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/QZCE61801341.