thumb|"cempa" or "cempan" stood for 'warrior' in the ancient Anglo-Saxon texts. A champion (from the late Latin campio) is the victor in a challenge, contest or competition. There can be a territo
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 0x88ad6133d67f47f9f8590642f538cf932497879dafa5491f8d0f59beffb6af24. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/79bc2f38-84ba-4abc-b04d-aaf6d8d55462.json and https://artists.proofprofile.net/proofs/artist/79bc2f38-84ba-4abc-b04d-aaf6d8d55462.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 0xfbf7f7ae890c9bf2d988bc40dfda285af3f0f6470967ea96ea43e8eb40e314ef. Chain 2 (Bitcoin): anchored in block 956862 (2026-07-06T02:10:22Z), 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/CAL660400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8147f82b5475b201b05a5d1d844b5b0aa92bf82e635cbfad1621dfcf5d43cb9. Chain 2 (Bitcoin): anchored in block 956485 (2026-07-03T10:53:04Z), 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/CAL660400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x725518afc2ff136c7db87ed6f07a3e6c7953553ab8f2e4d7758333ca0fbab98a. 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/CAL660400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf49437714bc2bd930dce9f4bdc3bcdd95a3b91c80c740f8e2b38143370c2dd85. Chain 2 (Bitcoin): anchored in block 958945 (2026-07-21T00:35:28Z), 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/CAL660400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe778356b3f24053b3b044032972d6cfb48be55241cd0f99cc358e986b46e4d8f. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/CAL660400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa42cd7c3453cbe96ba5cca6aed46cb30dda41e775bcfb132d8542a77bf0f8d2d. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/CAL660400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbae7803f48533f37edcded3433e5343847046dde59d5840715dfe11a4578b7a5. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/CAL660400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc944f6028faeb5e3fe64eeb2c64fa29ca490781c8ec38f88c4ecff464ae75a24. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/CAL660966605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbe2ed0707d092d57d55d074c9fcd051d51a075cc1ee6cac5b2c409527fc86b7. 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/CAZ841300038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0190d6c9520e5a3d29bb4d988d93105dd9eefab02ae00e44962c1fea29f9557. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/BRACT1600760.