Six By Six is a solitaire card game played with a standard set of 52 playing cards.Parlett, David (1979). The Penguin Book of Patience, Penguin, London. Winning depends mostly on skill, but even wit
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 0xd2c17a6fe7b13a8fd8bc8ba42701a55a0918807bdb5e26d401818ede91fcd6e9. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/41eda4a6-e717-44e8-b313-4944ff276bbd.json and https://artists.proofprofile.net/proofs/artist/41eda4a6-e717-44e8-b313-4944ff276bbd.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 0x3c77ef817716d881bc4a91879e5085217567a9d95326e013cc0f875beebc66ba. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBDHC2444405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc37a393eed38f0bc657c02f3ed90fbe6d520cd7bb70fa8a00c28e56b3d1b6ee5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBDHC2444406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba50cff6bcc5a2599a28c2e3ee478bd7cf66830c20ff87cc19040f02c41c2f7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBDHC2444409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b9d89ce6f9904f667fbe49eadc0c3a88a9e58abc593f0a3e729693d249c394a. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/GBDHC2444401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c71f8428f33c665d6759ec3f865378522b8b1abc82f2bfbe07f8a84705a5d57. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBDHC2444402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5efbc10fdd28b12f8e697fa9db70c5a759e07378e8cfcb10000626befc5f666. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/GBDHC2444403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa789741053e427bb5ceb6a5e53fd861e85a17d43d9a32475a7a3f9b5df29f0e3. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/GBDHC2444404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ff0a8397d6c0d10450c4accf794ee7793bf1a53a62a58658c20cb642a7857a7. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/GBDHC2444407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc93a66b4647f8f0dd2e56d90ac0d417049c276d67219cf1c2e8124a1d6681c82. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBDHC2444408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf19cfaae22ae1b7ab923fccbe9b8529cdff9bde95e546e5b59b9d8d8878a7e94. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/GBDHC2444410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d73f761a528d6bec8ba0fb1e612bddb5b90e7a4daf2745b5a541cd53dcaf6f9. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/GBDHC2444411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e197a6cb110cb404681229d6749726884721e42e1c7e013067d2dbb6f178eb2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBDHC1900104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x957f1b5d81e710eae3d8e4387cc7e1076016ce54a9a7b400643e12cd5fed8b2a. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/GBDHC1900107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a4878eca052c42d133f2a688e01411355eabcda907fead75af75ea453fd87db. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBDHC1900108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x274128d0382daaa0570a170ba6c700f2af4a7edea13805799a84004d45b8587b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBDHC1900109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6a1efeca17dc7fed46663d56e9c3457ebb41363c3aa5d3dbf775fe9f32d1f95. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/GBDHC1900110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae2d1f6abfb157c414c29147981ab8d6c549a5f0c7b8190895aa0021bbaecd7b. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/GBDHC1900101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f67a8e574c570af67c7d55554b9dca9e0481419a0c57de58662a762ab0f7f3c. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/GBDHC1900102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92806d4f652878202c061f43ee4afba68706d1cee23f7a1a963be9e297dc499b. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/GBDHC1900103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72cebb049bebfd3004b15682a894639cd5c7019ac64ed12720d1ba0af8bd6ce3. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/GBDHC1900105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c1e56a5ab11063e971c3a05272ff1baee89e109dbf0ab12a43d25d73dd8a8d3. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/GBDHC1900106.