OTR or Otr may refer to: Arts and entertainment Off the Record with Michael Landsberg, a sports talk show Old-time radio, a broadcasting era Otierre, an Italian hip hop band Science and technolog
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5c1e5854b2fd31dd30af7bc3ab9b8ee36628b972e1df662766c0368a63bf04a. 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/f7a7c893-4b4f-4ff3-843c-9e8da7b2a902.json and https://artists.proofprofile.net/proofs/artist/f7a7c893-4b4f-4ff3-843c-9e8da7b2a902.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4797e3d64fa0fdba251676b84b4bcbb538a43136025949671001d6a09052582b. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/FR2X41722190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbc3518037b4f18116dcd915bbc678decf874a0a3c34c9ebb5ca19e27e4fbdac. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/FR2X41735928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64252fce76e221e74c54ff3ed3fef22d7540efff49116eb71e8888fdad808aab. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/FR59R1703109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x136dfec14a1f985a64019f5bfe9779ab2ccb7bb01adfd3dd2617b9b00102d900. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/FRX281731806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e528e784e67b44fcec5647b520f822574eff07b6938a51a70a3dba2904788ba. Chain 2 (Bitcoin): anchored in block 958945 (2026-07-21T03:25:14Z), 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/FRX281744031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa500cac9881aab8ab700035c7e5126600fe557f9a53c1ff86a894886e1fcdfff. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/FR10S1809217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc800fc42012558fdcdad9517963f446a22937a8e160d5da0a8e3bc85c9019a1d. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/FR10S1809216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa15c050d808e811cb42d1553263e94da91a1d2f61c4c21bc26f6dadc7fa141c8. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USUG12000178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a2d64e6dee9420eda85c9974b58f4fab8454b499b677f5886a92b667982e82b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USUG12000174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56f79b45033c9e1f8dda931f1b00d37fde9a584e690b54e3927cf2a6e8543cbd. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USUG11903410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe175f864581025a62be9f949e02551cd5f1c43a7bd09577fb82bcbed2cb6dbd3. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USUG12000175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x239518e10fe5fcccaef9f5d486fc6248288592175f3c0518aea5ec291e282194. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USUG11901169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf73f38a596cd2a0936b9f2c2210bd47cc5adf68413063f9084f58b1a16ab1d82. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USUG11904395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37375e187939575da4fb75f1f56ea285ff5e14abf94fc5522475327baa287bef. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USUG12000176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26d4a38c911a41b6cdf47c029bee6964a2aa21529b2f318023eefe869690410f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USUG11902381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9eddc72cad72882f30ede07a18283e43bb7e702aacf8452f67ebb2222342abf. 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/USUG12000177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa15c050d808e811cb42d1553263e94da91a1d2f61c4c21bc26f6dadc7fa141c8. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USUG12000178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x851a3383ab927f6ba64e83a81a93004a39bbbd04ed414e3fe15729e2281dfb1c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USUG12000179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed0064fd36c86adb2d37dace5abd3069ab4c6084e607c2c00ae9f25a0d31ac68. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USUG12000180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92c5827782f3a3f801f9cde89f5564753581451030a47d42eaca39bb674ec5b3. 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/USUG12000256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72e4d7b9363f8a6f837c0b689638f0c06d0e45d795e213ac4fb46d6ea9eceea2. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USUMV2001477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09e6b7c924b800c4b89744ad301e94ad48bb3e12f0416399a622ff52440ad4a4. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USUG12002609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1af0e6101cd0c93189b6a646d216a8b119923fd9824e2ee547a2792553848244. 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/USUG12301693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa344dc4d30b102bd29bba3bcbf6a921774f7743f17dea41294401d269495774c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USUG12301683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1af0e6101cd0c93189b6a646d216a8b119923fd9824e2ee547a2792553848244. 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/USUG12301693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e6e3d396228d01794c92c2f2128aa266ff4c2cba7c2ab1e540410c13e60471f. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/USUG12301703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ac7772e3385fb0793018b7bb270624ea8ed1f150e518aed3ff40f2b1790c9f7. 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/USUG12301701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa16b1fdbc494daeade1d90edffc9a95db48354c9db86996486debc6e4d2920b. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USUG12301685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6201f612764ced200fb20a30fdfbf4e8b2100b8ca1e70184f4913a327ae900dd. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USUG12301691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e140b9aef9e48b8ea13a19cc8ae4828c0442f429aab5b30c9e1034165f73a5f. Chain 2 (Bitcoin): anchored in block 958945 (2026-07-21T02:26:15Z), 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/USUG12301709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd59d2ed0ae45e1c1107728b0f1ec2eea673b5f14daa61ac4b1364cf965a40ee9. 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/USUG12301695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e6e3d396228d01794c92c2f2128aa266ff4c2cba7c2ab1e540410c13e60471f. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/USUG12301703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e1b1808af8d371febea4562171b57dd706e3097113d16e0bb19c9f6c998f5c7. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USUG12301687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cd9e77450b1114e0963530272e5950c0c39551b5dc50cae89e8a25cb963d604. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/USUG12301705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72748f97f59873c2d63d80ae68ab8ce75a6a0126e3835a70cf31bcd949b710c4. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/USQX91802607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf0287f953d24a719138f3e3ac6db1fdf56361ffe7e18291aee02a96733245a7. 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/FR2X41879589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88c079164d8e63e67696f3a5450498818effb5ab6b9ae54db69214c146bc0b3b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBEWA1907630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88c079164d8e63e67696f3a5450498818effb5ab6b9ae54db69214c146bc0b3b. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBEWA1907630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ffaff2c1f3b77ba023283d0bfdf366f53a6a77bf5c455e1975a5006fa109ede. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USQE92000165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf0287f953d24a719138f3e3ac6db1fdf56361ffe7e18291aee02a96733245a7. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FR2X41879589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x054d097e0485d592aacaad7d68f38120ea3f45e3fe35b1af66da2853f3c67159. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QM24S1700677.