SK may refer to: People SK (actor) or Sivakarthikeyan, Indian actor Salman Khan or SK, Indian actor Shahram Kashani (SK), an Iranian-American singer Shakib Khan, Bangladeshi film actor, known by
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 0x3a122db831424b74874f94452d6eeef679415ee9f7338d52e25f743bee8c1848. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1ee2aa08-20a8-4ea2-ae6a-3afdfd2d70ea.json and https://artists.proofprofile.net/proofs/artist/1ee2aa08-20a8-4ea2-ae6a-3afdfd2d70ea.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 0x1f2010f3cb57c70e862bb7796cc8553e23f2a38d460ffb5843d5370c16a8c788. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/DEZC62039915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e90575ada2064f2d41f77d740e43af276c474e7a64dab6e5aa0984c7c70ba56. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/DEZC62039916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x687099116a56852c17d6fe7942470d2f381c01e26c9b6af45da4e267f769c999. 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/DEZC62039917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a3498db7ac0c44194eeec927280a6369ebeabc7e6db14704507b2ee0ed46d9. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/DEZC62039918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8024b1600ebf71b5a0f22f832260b5b428fb529264b0e35a31b5793d6963330c. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/DEZC62039920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x129e9eaab5916b6174497cadf014abc6e7c56f73f03a1197da930b8b63fe558d. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/DEZC62117754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1596f67971a980224a87c47f6b7ff3dee9e2038173996044b3f3ffb4d9b3ec3. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/DEZC62117755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8344c95f246b7cb3e63a126a8b1c4871965217de589d3fa683fec966ef9d3909. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/DEZC62117756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e5de6d770c29f9eb2f3565c2f71b457502631e5773f172902f70d9770d3af6f. 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/DEZC62496232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4a74bde4f3feedf81d1988c9246ff1ce54b752c7ad31e5ff3f4f85e5af2f7f1. 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/DEZC62496233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae046c5833220b54135305f807f631791da56d0a39c35e592bf0b4cb0c63eaad. 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/DEZC62496234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14cc9eba2e166dba84efceee84cd8113bd5d7389474c33e7d1c545eaad940498. 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/DEZC62496235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3231069991656b2680630e820b260dbae67e7a33179000cadcb811252552107e. 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/DEZC62496236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49e881941b0c2beb67e8ba51085c7171a5f7ed1a75d1f78a00874ac91b0d2e12. 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/DEZC62496237.