Mary Riddle, also known as Kus-de-cha or Kingfisher, (April 22, 1902 – October 25, 1981) was the second Native American woman to earn a pilot's license. Bessie Coleman was the first to earn a license.
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 0x8394913c6a1d126ada8c87cf229a956131889cf7bc48ea6ed2005e6db6f3e03b. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9430c1b9-2c58-4969-91fa-46f35a2e3ccd.json and https://artists.proofprofile.net/proofs/artist/9430c1b9-2c58-4969-91fa-46f35a2e3ccd.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 0x3ca9a2b56f74947eca00700c63c429d51de7345bf846869968f7aed33583a536. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/SE5Q51901533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c261e81146267e2d8ce4195377243da07b5babf56efd60a43d3f1fb77a8090b. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/SE5Q51902024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b8a3589b0eab35d1aa7de0bf2493244b0e42d4f574692bb3179d0f93e0090c. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/SE5Q52001171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0a158dbefdf18c6b3a792e2250322ce7813fff9a20c4d8cbbdb769d08aabb93. Chain 2 (Bitcoin): anchored in block 956404 (2026-07-17T04:42:19Z), 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/SE5Q52001419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb83bd70ef13ac2485cbe3106e21c7659ba7675df8bcbc50e0a48d2b4e79c152. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/SE5Q52100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe012d71896cf49be09e93dc7be113396e62b84192f0b38a6f48b8f8830c409e4. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/SE5Q52201204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc80f7b11e5d3f172576f95315eb29338913a700448483761b95f42ba308b5e6a. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/SE5Q52203842.