KK, K.K., kK, k.k., or other sequences of two k's with or without punctuation may refer to: Arts and media KK, the production code for the 1967 Doctor Who serial The Faceless Ones "KK" (song), a 201
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 0xd01d9b3522def61302ab4e0c0b04f14e1a928890af688996eb66547c5f8f51f4. 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/8d9d7f5f-73ef-4564-8252-d81d438dc936.json and https://artists.proofprofile.net/proofs/artist/8d9d7f5f-73ef-4564-8252-d81d438dc936.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 0x54e3d321c34f5eb2ec910a98c98786a3ffba3da751336bdbe1eada4db87e1a8e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ISZ109200501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b27a92044dee755435566e11245637db1bff57268777344f6ab37bacd1d2b92. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/ISZ109200502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84e5960b43332b6596715f2b63f1d1483b464aca6be856e0905f0fb92b2d1f5d. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/ISZ109200510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3967c52536a75eb28a20c0047e7ec53b06963b4bd8702a5868a329bec857d8ca. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:45:03Z), 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/ISZ109300601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16f7ec04f45d6dcd63d6735b178fd10b67f121c83c9f6f5dcfa6e2a2876ce12c. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/ISI109500407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce97d8b9f4cadcf67aa48c9030af8fa2248ace765dbf09f1778f15031893d38c. 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/ISIRU1000019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea0c3cb37d0d0bfac92215cc77417a67dd5e9ec1283f8d169c8d5341e7ddaedf. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/ISIRU1000020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bddde05ad6ffe649d21424e5d93ad7180099ab450f45b374e10fbbf1d5f1a5a. 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/ISIRU1000023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7c4534dcdfe9419ac264f04258b0eff769ffba6e76925e39b5e839d796e80cd. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T17:52:41Z), 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/ISIRU1000029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x744b7a0177efac7d66e1a64aff44456d2f8bcc8d7e07e64718fcc6b1975361f8. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:46:34Z), 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/ISIRU1000034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48f59066f9a2caf384927fcaf44b18deac028978e2ac77b6ce5bd61b300d7b4f. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/ISIRU1000683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b73ab951ac69245663daf4b89cda2a44f00970b6b6ba46c9452a28b2bedbc43. 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/ISV350800203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae21e46174af7a444e78701bf037afe7bff2c7d82af5d9111dd17fe05a145578. Chain 2 (Bitcoin): anchored in block 956841 (2026-07-05T22:14:35Z), 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/ISV350800204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x770cb30e369cbb1cecb9885f77fee9f4e03ae85d7f7e1d54edfb1745f811305b. 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/ISV350800207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbbca13718c3c25f6fbb8e17981b6c496a682f63d903998659e69a855dbcdb2a. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/ISZ981100430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3da438ba986e8a184cf3a67a62d7ea002e443a8e88b9b50db74ee4eb689689b0. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/ISZ981200174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x054c84d492ab45b3bb4637e11df017ef6582998da11e8e2b2b0e315a71110bca. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/ISV442232901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fba379251d183262c8c476eb49770cc5f4223dabbfeb24093b8cca4f572ec0e. 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/ISC112500201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87df6a41b6a8029569fab1321ba84cbf07feab486cde31b4e2243f4ac32957fd. 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/US6QR2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16f7ec04f45d6dcd63d6735b178fd10b67f121c83c9f6f5dcfa6e2a2876ce12c. 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/ISI109500407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbac4039fcc693db7427ae0da1811acea07885315c0708ab26e3b5ffcdcb6f9d4. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/ISV982448004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79707b70a9b51bf7ce78dc2eca5f4080ae42785ac4d182cf4391f06279a0252a. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/US6QR2500019.
Jól Eins Og Áður (feat. Sverrir Bergmann, KK, Birgir, Sigga Beinteins, DJ Muscleboy, Aron Már Ólafsson, Ragga Gröndal, Katrín Halldóra Sigurðardóttir & Jón Gnarr)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50ff73d11942ec8fd0496644023c5dd5f09a30cf9ac69a5c5fbbbaafac8d24f9. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/DKADG2001049.
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