C9, C09 or C-9 may refer to: Biology, medicine, and chemistry C9 (Complement component 9), a protein ATC code C09, a subgroup of the Anatomical Therapeutic Chemical Classification System C09, ICD-
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc220c68ffe1723af4726bb0907c1905200873b3b487f90dd44b20a7197a5076. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/79be24ce-48e6-4483-8bed-63abf025274a.json and https://artists.proofprofile.net/proofs/artist/79be24ce-48e6-4483-8bed-63abf025274a.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3c4487994bec49a4cae082551491ec95960644309a645934bed2458f145263c. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/SE4JC1400601.
A1T8i (Kobana, Rick Pier O'Neil Remixes)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc390006bc2bdb920ed149f11676c37e90af0fbddcafab3243dbd2790e2d438c4. 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/QZPYN2214000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x666d113b1c73b7dd1b94c4015b7d60cc71d748cdb16063db96890fdd0d46303d. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/QZTPX2311888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1870b21da295dabc654dc2ba1c6ad5de4fc5801dad919302e7eede9144c7cf4. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T22:55:48Z), 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/QZPYN2467498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe56be946cdc839ce5b16ff01fbce069072885d30f4e3cce645d076adefca4f0d. 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/QZPYN2467296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5459fc11d63daf8011258a4c2ef10597ee7648077845917e272e44d5c308449a. 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/US7VG2579372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9258d616f7b4cfa7756a054620ea3fc87ad169ba32154ce9e8057242e4578982. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZNJZ2580262.