MCK could refer to: Claisebrook railway station, Perth, Australia; Perth transit station code MCK Macair Airlines; ICAO airline code MCK Marist College Kogarah, Sydney, Australia McCook (Amtrak s
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 0x1beaf1ee013038cdc247e07b9789e8db02046042092558f1e5667c2ee13880d9. 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/0bbd5377-d88a-4b15-a888-6ca4670ad99a.json and https://artists.proofprofile.net/proofs/artist/0bbd5377-d88a-4b15-a888-6ca4670ad99a.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 0x4a67a4de47404631e059d08c4bba247c8a6074df7572aa3429e77bdcb8b2db15. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZDA81894968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f26fe7d4b821f899025a62d5d032d671721d19a7397e04d5e0448347ebea43. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZDA81894971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cc80d578cf0f1e2f8afa087ac238c237f7258d865f85d1c2cff5f3fae959570. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZDA81894976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d8e61d3219588aabb6d0f68adbe9fc2ee75aba8370d1ec11d021432da85ebe6. 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/QZDA81894979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x999906893685fe71d7ca4fdd3d63b325de7bb95859db3e797013b02abc6c2c1c. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZDA81894980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2119bd39ad31f06541a70287a8b9e1f6076fa454107affdc763e4f1a0c55cf28. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T20:38:50Z), 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/AOGEA2200858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x141193a017056454b7c7d0486b0bcdf61842dd41714607617238e016dbda9def. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZMEP2415985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1972d9e9e9840d6517ed8bd1a5d6a4b74b3549bdb8e8ebcc79c0fceb824359c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZMEP2415986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x747cd5d5db67682257a03bed478c350f559e019f270a1c89db641a717b1388d6. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZMEP2415987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88bb68a7d00de1452b832bde61904e346d8d6ed9763f134e5772f9487ea29831. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZMEP2415988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc71fab851b0c7305cb345b86e8e60ee8be3715d9186592cf9e21a54a372d552f. 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/ES71G2409412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefad49ab05ea2f9da854fc430f44a20a9067af3895b3cdfa352889a41e78001e. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/ES71G2409260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff194fafbcaf67a15a3d3c95b0e67127c5f43a0d2fdd28546521f9bf315fb7cb. 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/QZMEP2415989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31a79c03eb72e5c3b5c86090207796b70697c41ed79d71aca7b89c7896a6e3c2. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/QZMEP2415991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd447b7b389bc0140114283cda62b333fa759f8246fe67f7a84ad629f57520f47. 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/QZMEP2415992.