DDK abbreviation may refer to: In software development, a Driver Development Kit, including Microsoft Windows Driver Development Kit In hull codes of United States Navy, an abolished surface combata
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 0xafd14eb412575e27c1cd444df14c44742be1d6ad00c46c9fb4865f4da33bcbaa. 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/7ad7a707-3e9e-4e1a-8df0-0bb3e08023d1.json and https://artists.proofprofile.net/proofs/artist/7ad7a707-3e9e-4e1a-8df0-0bb3e08023d1.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 0xc96382383b869db36cf0affa9f0efc9535fad9d38f83a3688eabe1975fd28136. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZDA82145384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfed361b66fbf3ac679c9a4ca7a7f4a46f87b8fb07aa0d7486013010f89a4ddd8. 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/QZHN42193444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ec18d9ee106c7694d93bb9e17652660ea95966673b6aa5a62583f1fdca1720f. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNWQ2154079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9f7e7b525fecec4cb03741ced7b4cfa4f5d9ad51fcaa6619ddc59026acce6b4. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZDA52294955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7819fdeaf85de50d7db5f7844fae9685f50be331d9578975190a4d7ae46ab0. 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/QZHN92234171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dd5dd21dbcd89f533e8e55df0f2b55c7b1ea0fa5733c1fed465c3c8e5ccdf78. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/QZK6K2262419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51a9817050eded2905c196e93082be4291b7861ec5515ff0a5fba6fee00df7c5. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZNWX2281432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23955f3ef3443268095cdbef991c2f82c01df0c85414f56f48a2eb4526a7936c. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/QZFZ22339440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a86a38b9e0e70514547bc50afb9b0ab6e1822d633919a9a4e9691c090c2e29b. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QZFZ42372699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97a2a5639f26589eef4eb4f7ccb286e58316fee880a037d6f95b6a821d4cfce5. 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/QZES52365779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98f7333285ee805def92fb581cb9cf6bafb4b681e1204e6bd232550061923c2f. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/QZHN62387420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a852e570ba0401aac17c457dc9356abc843f1aeb7c33e51ee2a396c2e4d66be. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZNWX2399483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f339c2ec0f818271f94c4df998791dcca8a47328d8d0b939284c5007348ccc4. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZTB62300197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae82afae4eb6cf868177ae8d5dc9176423b4b69a99f55d972e5136a230803d6. 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/QZWFG2327922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc36eb23c0da90c0a2aaab90d13ad64334c0af6c78265ce2a48988695798a77d5. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZTBC2438468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6be1aa078292d2428be50e41714c91cfbfbb5a2b092055c6fd5325e89b7b4255. 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/QZWFK2430913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00690db778b01594b8dfd920dc849c28e6cff0962b4f4e9da09500125a5e4775. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/CH7811114775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc11a43e708c3f52cb14d6dbffa45dfd88d0c93b5cf75e5ed8722b2987cfc5eca. 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/CH7811114985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00690db778b01594b8dfd920dc849c28e6cff0962b4f4e9da09500125a5e4775. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/CH7811114775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb59ee51cd4d165ded61569defcb09486fab210cddefb8084ddd9f19638e9ac5. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/CH7811114987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a0a5f9027723b22e5908abc016b4e0553824b9f9c0d4a4699b4be7d958cc5e. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/CH7811114988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x486f3faf7329b818a2f3d4024a12df19f2a6a2218e3d1fa0e90ba0c9fd7dae5d. 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/CH7811114989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb877ae71dd11b34e845247b402f1a014441e6cb11205c685e743832c3ecd2f6b. 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/CH7811114990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2962d3e35fb257b93ae2074cfc7fffd3230b55a210ba30f3aa43b4bea3c6fcb1. 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/CH7811114991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc38bdc755bb080bb97df7f280b027935daa8976e5919d958f3ab24343f1df5db. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZMWW2512254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd60dfe9a877adbe754035bcbd4f3852495b9b50f7f8a51078aceb3a2488d1078. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZMWW2512255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbc3a090a834de59e2e6592b425562682565d04a7f0474fc2e00c2299ad16f6c. 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/QZJG52558303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13e74049b8ef9df8d140e110078c866af1ccf40a7877afe03ff766e2dc8551ef. 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/QZES62229446.