PK or pk may refer to: Arts and entertainment Gaming Probability of kill (Pk), in computer games, simulations, models, and operations research Disney's PK: Out of the Shadows, a 2002 video game Pl
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 0x898526f9d7a7f1a5ea1d9a11ca652b1f9a2dbcacf27f423ce121279bb8eb62da. 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/993745e5-8b51-4b24-a48f-be773d94b0a3.json and https://artists.proofprofile.net/proofs/artist/993745e5-8b51-4b24-a48f-be773d94b0a3.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 0x1654e6ec3c1dccb10796e98226b45bff839bdf4581c272d36435dfed867734a0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BRWMB2000623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa4c7f6a58536fdf09f7cbaa61a3680c1246dfbae6524526b0140e74a8e2e6c. 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/BRWMB2000161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdd444798a281a51c4b0e11d14a0b352596c4ffc0d9bdd6f1792d9fdb6d7f251. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DOA592200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6612a3fabd790f2fb2161367d3ad0ae1bb978d8a7408090ae94c8b18195d7931. 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/BRSME2004873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd537c1e45316bd71142aa2f8e8289e665aa6a8d02f8040a68622bb6de4c2277d. 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/BXLKC1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92ddc28829f096e3cd3e43e5120b692324b7b120744a706f39db6c03e3da40ce. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BCD592100081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70e0c46e1fc1ce4e891b909d907aee1cb3248b6fe38378fa13793169a155337f. 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/BRWMB2100232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d529a8b537fc3d99c4ba1299fce191150dcb74ec85038b624dd43977cf30468. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BKIND2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45d9b53e927958a735e12f71d26b414f47636c82dc7443eaf60e8a2d72f42614. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BKIND2300020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ca040e78af111b5e22391ca6f645d8c5b550282e34246504fe9a891e0b05d89. 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/BRWMB2101184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0542fea7e0ff8a158f81e101e829a93ee20a4d613b1e157e9051bc86720232a. 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/BXWY82400009.