Blowback may refer to: Firearms Blowback (firearms), a system of operation for self-loading firearms that obtains energy from the motion of the cartridge case as it is pushed to the rear by expanding
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 0x03f7415273910d368b98687e2454393b9980b51acb21be12121658c8d6e57bf1. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/84e617e1-f366-4746-afc4-7436f4d6a24e.json and https://artists.proofprofile.net/proofs/artist/84e617e1-f366-4746-afc4-7436f4d6a24e.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 0x090bf8a35be1c9dffdeefb15926679bcabc9f1f7500ac173ab6d5c9c3193124e. 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/SEWXU0901501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d67da1d16f949efff69ca6824a745100f6446121177fa1bb45e9893ba7d2598. 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/QZNWS2137417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x948d5a3cb69cbf6e1447e46a7551e233874fa54c605e38922989111696103d07. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/QZNWS2137418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7fd5c851d28879650af78c2dbe06607d1e024abb984a7ce781469a2a37d9bdf. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZNWS2137419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30e39e347b3ad1172541d534c629a0e9863aa7c5fde86734a4d31fe8137e9a75. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZNWS2137420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c2553d51f7b788bdadcee220d9cf946bf0cb2a9ef9d3a74336d01dac7a8904b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZNWS2137421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5233f51d1e66bb0469620398d8b12f0457a177a5f1e117da38c8335cae99ff4. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZNWS2121442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5229b476509df08a71a1d5e69f75f31730f8238041f5a850f673b4c1ebcbabbb. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/QZNWS2137422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d8c2c31d5941e1b0c5ad6130c067628360f7dc4d0a0fe5742803013b01dccec. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QZNWS2137423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1ad19c4e4b7435861da04ec556b3df9830e704ab2e20f07ee0ae07569d71ea6. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZNWS2137424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d8827a9ca8bde686282c064fc494dd96fa652a55baa39b99467d6f93697224. 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/QZNWS2137425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ad01cab05904e2fcd0a81f1e3a10af00bd257939d367d64c05312b3ad53091. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/QZNWS2137426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93a8074dc605f5ef567593c3ae6175bef385246a8db2a6b11521563ef17dcf04. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZNWS2137427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e62f6ea8dc73a5ccdd91c0b1aa08492eae368776f701c1ff0ed33be38aa1454. 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/QZNWS2120685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ebf6a8821382bd4054d76707a5930691a9d0b12a52759f663abd593d2f2fdec. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZNWS2137428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd6a79022b8588ccc92f9099f42cb1d65110c83ca8c2460c31ff64a5d2745374. 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/SEWOL0710013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0512958d1898e7ce613bb65d86ab3267ed782face10cb8d9c6fee69ec2ebb8b. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/SEWOL0710014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb78ae36a1f0cb9a30295b08cd74590272b48163763e698618f8b71b9cc59b24. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/SEWOL0710015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045f14283c0a5f8bcb703366f9772ebe3c60dc3818b6bf362c0b66f926a1d54c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/SEWOL0710016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ef4bf4086d8fd9faf69ff71f1201c32d4e8e2c531f2e7f3e4b07fa63d694ac. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/SEWOL0710017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13a1afff389282e4fef0455efb3c2f880fc858c0ab95856be7cc4d07f441064d. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/SEWOL0710018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b6e0159f44e0f253bc94e6c2f2491ee82db3a2a224456e4bcb3174608f66f94. 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/SEWOL0710019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x076a4ff2b6dc02dccac9a80be1582fc699e2378e54ebe97508b465092dc8ea1c. 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/SEWOL0710020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88dd75dd41dbc2afb964a17e847d15e73f5647fb3f3b6f95fdf7b828f858c623. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/SEWOL0710021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x731acbe904588b1c4dfb1528896c59838da38b4363b2b47ae07989e234820f63. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/SEWOL0710022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x999b68298758eb7b305f031d1677ceecdd7808ef607722a0ff026cfc7feebc87. 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/SEWOL0710023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf67108501fd44ee69a7d790e9d62b66b81df93d9125d22e363e1994f124c01. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/SEWOL0710024.