AK or A.K. may refer to: Arts and entertainment A.K. (film), a 1985 film directed by Chris Marker AK (radio program), a weekly program produced by Alaska Public Radio Network from 2003 to 2008, lat
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 0x93b68ef6b4ae01b3cf865478ae42cbc53656432a1b3839b3167b459ab838eb8e. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5bb5921a-e0f1-4ee0-ba93-4d3371ed4dac.json and https://artists.proofprofile.net/proofs/artist/5bb5921a-e0f1-4ee0-ba93-4d3371ed4dac.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 0x311b54b9db9fae7cb9c408a1f47edd3eacbd7c35b7c643fb20ad0c890a138e55. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GX3HH2104130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9c6341305a348c31a26d348d2e2f6663fe545a2215aae894f2f3a29b7a16e96. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBSMU8963985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66ba7543a16dc0b22b0270b2cf88485232e9b287610d51175c0839e46a229dff. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GBSMU8123818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57d8f6637cbdd7ad829a7930838996bdde3b33e7762c7620462f28aa0b74a2d0. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/GBSMU7632105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x928cb51a123ac523a851b7dbcf0cb19d98c13c7cfa3f92afa71d1097ccaed3f9. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZHN81920178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa538e28caa5c471d31f834baa2d7883a478d8779e47802997f41f7cda8ae8651. 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/QZHN31921283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa07fc0d087814321a6c0a7cf9fc5a898239cc601d3bf7aa18c75c332597afaf0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZFYW1978349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20d138380181d69919f3c60f67858f88d144a3f52c9c8a8673df5ce8dd3e8e33. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZES51952817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a78813c9d6451d6f2d9fa8a93e535b10dd7c5e6a5d96e5210b81cbfb3e66dd0. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DETO41822918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cfe38ca404e748e800fad9fc111a8eca26acdc9af9b9d1851f6f205f258a99e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZAKB2430018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x613bd91ed882a968c052070510b6ec76368819d4818ae6e19184bde2274bfe0d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GX3HH2269598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cd88e087a3f63d73cc7823f890a9f97a9fbe23f382ad8bcfaf61a3a88edea78. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/GBSMU9397666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf64fd73fae54dad97b834497c138816f44d562d93d61a07d3eb5e2ed198c0f39. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/GBSMU8817404.