WK, W.K., Wk, or Wk. can refer to one of the following: Businesses and organizations: Wolters Kluwer, an information services company (EuroNext code WK) American Falcon (IATA airline code WK) Edel
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 0xc7a255920f22994df569fb85d861361e7dd27c54850683aea48b979f316db7e1. 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/d8819b8d-c762-4284-b4a8-69c6a30c0646.json and https://artists.proofprofile.net/proofs/artist/d8819b8d-c762-4284-b4a8-69c6a30c0646.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 0x68c7dcb1bf6efa3c031dc1de5a1d9fa4f76e669afa82ff40530dfee6f2555a5f. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/UST8K1647736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81a0dae2616678c6801a2ace0cbf0d897d6d7c20f175c533a217fc88e28fee84. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T10:04:18Z), 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/UST8K1647737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53fa7099a25c0c99a0c1e6b816469f955933624548eb099ce28951d669ffce62. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/UST8K1647738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x070d72eec7090929e5a81e6a5b572bcd145965505a1660d59c684738fe847022. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/UST8K1647739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c358f10a9619e9ea982bb6855ea5527ab54ed202bbf5f51a612fdd4687a0032. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T06:52:30Z), 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/UST8K1647741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x147ac4ba22e9b0d6d6b903f5e3a6b15c6ebb4c86d0e19437bea0b6677a93665d. 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/UST8K1647742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3f604c1b6feb8efd8d2787ce88b2cd240b6ea5218234e7e8701e199d8619a37. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/UST8K1647743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabf65bce830d0661364b03e7180ca4a245f70c2be48fdca9a8b3af8c256bc5db. Chain 2 (Bitcoin): anchored in block 956620 (2026-07-04T07:11:13Z), 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/UST8K1647745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x360ee39399f0bc0da5e5ae5847846e39ebef3abfef877113e31180e826ab9658. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/UST8K1647746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x255626ca5b0a91fbfa7e27850c6af2c408415bdc2f3c163ce9588087ddcbb571. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/UST8K1647748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f6d899831afcc4a886900fc607c3684d5bbb5ab541c78dd3cb2ad02bce12340. 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/UST8K1647749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb21ae906ecd4c39e08069b606c5a5afaa3aa8845dbcbe988c6e62e45f7667dd4. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/UST8K1647752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0b1eb504066ca11fc6aa518e66d7c252cc54ea397606ac0a58de07b9d4afb45. 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/UST8K1691102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb91b180187ceee9a2d4dadb4fc4e092272cbffbd9d5cd4958ae6678be81feba3. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/UST8K1691105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x506f7e26dc03250f73e4bc39fdc098bc033868c49def115c98d9abf16e6a8dc9. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZ5AB1768444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ddf2b28701ac3a5c7cb8c78cb014d38f829233bfba48003f851bce33217ae73. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T21:51:30Z), 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/QM4DW1788188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cf5760ae87c5b8fad25cdc0bee7dfd00961cea6b63b4b5f4df74dff62bc84a2. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QZ5AB1768446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a5776877fdafc8f66c682b5b14b2d96acf21132e5e35762e0b18e41c04127e0. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T21:56:52Z), 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/QZ5AB1768447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x155e38b291c69c4a8d21693b8a5e9b5c0848fe9bc727acc868d23d753debc6bb. 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/QZ5AB1768448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x498db8668ac8ae0a81a7134aa2cb390a17883871b5bacd30e457f1ba02a3c903. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/QZ5AB1768449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f4875e83c2b47408e38027f725868a97aaae3ac33d98fcd0da4bc0554bd2a2e. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZ5AB1768456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x222097af7f8196f054597811ae11e70aa1af7a1b0fe9d9548e75b45ef946e7a8. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZ5AB1768457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49223358363b38894d5ee11ea13b260580e50d201aceb6bd2e06600199d17840. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-16T00:13:47Z), 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/QZGLS1976240.
Una Canción para el Final de la Película
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x041da778f98c0405c75eef5217b8dc6e24d33531dc46bcf5351597a34a81a443. 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/FR10S1971508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16adaa343cf43069a1adb69fedf49f4259860653f8db76aeaea04342660a1515. 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/QZTVM2446062.