Mare Cognitum (Latin cognitum, the "Sea that has Become Known") is a lunar mare located in a basin or large crater which sits in the second ring of Oceanus Procellarum. To the northwest of the mare
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 0x265057ea367c8ec49e2843266f13af31d782cf69010ed8fc56d62fb9b740c574. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6a49ac7b-580d-460f-8611-eacabbc39ccc.json and https://artists.proofprofile.net/proofs/artist/6a49ac7b-580d-460f-8611-eacabbc39ccc.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 0xc33af09e68999c6b64cd782534d669c661f1a96a0412dd9cb64d23875b46f339. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/JMA271496531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff2daf6e4b2cbb60877870452a27113d18dd9fa1d9bf7266779c474c72569931. 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/JMA271496532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea6af950bebaa84b2ef153be68c055485794da0f4ae8b8cc7b0216fc008d2737. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-20T00:26:46Z), 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/JMA271701983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b2a0c66853380c4200ed17b0267873cd1058300c5e9152e76951732b5fadbd. 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/JMA271701985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa922fd0dc66f5300eb29e42bf8a80b9e3fe293ef850627eab3854f373b7b8c3e. 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/SE5752044516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a7ef927057899fdc15057c540599b1e18a42e40389bd88e138ad1e88b25cd8. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/SE5752044517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf27a7ddafc48527740d00135318bd78aee0a12a74b25e5dea009718436337f23. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/SE6A92129805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a672aa8ad71b4608f39a67fa62b17cafba92b55b790e388a81489267dfc3c0d. 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/SE6A92129806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb777b87c065c22bac053adb1f8e16a44d63930ff44d66c8dd0810ce052bc5b6e. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-20T12:15:00Z), 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/SE6A92129807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x263df468398c58b7750666590e71a0592c73ce7b3caee52baf346b69d0a749a1. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T02:29:17Z), 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/SE6A92129808.