CK, Ck, or ck may refer to: Science and technology Conductive keratoplasty, a type of refractive surgery Creatine kinase, an enzyme Cytokinin, a plant hormone Cytokeratin (CK1 to CK20), keratin p
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 0x03a6c034e6b41cbf4d8dcea888cb63c53d64db8ef591223fb90ea1ef0b39a84f. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4e6568dc-d74b-4ca5-9c89-652fca4fe999.json and https://artists.proofprofile.net/proofs/artist/4e6568dc-d74b-4ca5-9c89-652fca4fe999.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 0xcbcf49ab32277d3af2f2d121da31476aaf8d9e543b910f7cc12a36d324c7255e. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/TCJPM2005804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7ea9f33e7f28328fde7814fa44937e1686f6a8c51b9bffb6acf27f911641882. 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/TCJPM2005805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e6167f12b6edec79ae5c0a9b814a3e0ddbbbec3c765599185149bed9be8591e. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/TCJPM2005806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2558aa6a4ef2538f37b4fc0b82973166a53c56c989c26342fa54b7216e7287. 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/TCJPM2005807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bcb052f64aff729b6e0c6ae31e9eb2b0ad9e5d21973825e74ee9f5612789629. 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/TCJPM2005808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23cdd50b6d9b1eabe2988f9c9e1f66a606b3fb919bff10a23f25cafe708a8bb3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCJPM2005809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4d8bd805771833d311d06e83f758bdcc17260588ac0c116f194691286d87fcf. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/TCJPM2005810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46d8ec473d966b6f4a9640dd0b8f08ace828015558b58e853b6703974a68d6c9. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/TCJPM2005811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb010d7a5353568a19da1868edd57f0c383a5b5d4af9cd63a8363598b997c851. 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/TCJPM2005813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe67228b095bf4aa1e40cae17934fd9febd65d6bb99da6d0b269ffedcd6db747f. 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/TCJPM2005814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71fb3afd9124414207725b3dafaec9940905ad109d88f471b7725771c056bcdc. 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/TCJPN2168863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x238602668d8ea3d5d624e139c3bb5edae05a50af851ef6ddcc1aa18b4db2d63e. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/TCJPC2449206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5cc0ced78b541efad63193d280a66f17d0d24b25a04472438647c6ebd99ca95. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/TCJPC2449209.