Checkers (North American English), also known as draughts (; British English), is a group of strategy board games for two players which involve forward movements of uniform game pieces and mandatory c
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 0xa1092cf4f278fb7c19abe414160148f8741edd90ee5d3036766335098155cbce. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9143d0b7-ca61-4daa-9d36-12038bb7b249.json and https://artists.proofprofile.net/proofs/artist/9143d0b7-ca61-4daa-9d36-12038bb7b249.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 0x5784f2f24334ec47339f81abd8f792d441da10a93498163e2b8dc9953a9f2a86. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZES71920239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41c7c1285de38831a71280eed7be4ced6df3cd21fb52707b73541180ff3d4fdd. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZES71920241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x296087603f0a368a4fed8ca0652387f40b3bb7a28ff7c62aa88060208aba4afe. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZES71920242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a13b5037f959bf3982b2524c53e96d4c74877e0872d7102e058ae88774e1ac2. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZES71920243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x132ed45abd9190f7a8e33b57925092c3cfdc5c68c34187e93133dafb457165ed. 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/QZES71920244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dbd4afe71ba4b9120ca4fb4c17e67deca436a51ac5ca7ae97eea8f89515d5e8. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZES71920246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc4c57af52c32903e4d691ba444ce7aabde4fe2d9a0832be21a7efda2824e90. 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/QZES71920247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x348f3537d9776cdb99908fcfb7bd1845a32d5b705481ccfb6b1bc2912d6dc04c. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QZES71920248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a388302b4585cc7905dd670eb8ae1ff87b8ac08fec9281b55c67b2a633905c4. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZES71920249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x637b398a23e7ae958286b88182e8920127d5c1f876844b952f715b0fae75019c. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZES71920251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85863d4657cbed2b92edfcbc6d75342101d7b086383b0caacdbe57591b1426f9. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZES71920252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ccc8ca70507f3ea61db81e928b7a3505f89455e9d3b8068ccefa2c33348218e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZES71920253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe211263f7adf5be7e909a66d11903bb1f85e69d80ff05777b4acf14e3815075d. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZES71920255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94433bc218044ad2f025782641abde79ea333bf74d94df947c5bfa1c19aeda5f. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZES71920256.