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 0x47ee35e7e253b972d1fa70e106dcc4a61fc86af6f2c1d437a21058bf7f8641c2. 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/6f19a0ae-da06-47a2-b9a2-5a3d7cf53768.json and https://artists.proofprofile.net/proofs/artist/6f19a0ae-da06-47a2-b9a2-5a3d7cf53768.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 0xe34574c5998573755f660f79df4ca01935b83724ff73df080090466d5d069688. 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/FRZ052000151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71274a6e9560e3d2c5bfa98dd0e420222df34edd7dca1f5f2fcd37d3bf1b3ef3. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/FR9EI2100360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4107354a83e2bf3591417682d699d8991fad028aa3f0baeb0694867b52bcf465. 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/FR9EI2200350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40cb31435b35b59dffe04d640e7d70de06cef2c488163c705b36f2b92a5bf2b1. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/FR9EI2300040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42ffc364c08207d78550be80ea476fc900e63b9b5ff8bc4a3894ecbea06b2188. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/FR9EI2300060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd25f9f90a6f35d622402f51ad18c768553218fb2dcb738cc6c76b5ac2edf7cda. 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/FR9EI2300130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35757c800fc21cdffad904e6640879733327d065caab53f80cfbca5a0c13de9d. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/FR9EI2300120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c1fd5789df7bc0d2ac9af3becef52f0e14b879cb4b4e5b077d941ccda00eb52. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/FR9EI2300110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bf3ca465e0af7434075ae6a84f6bdaaad5cc77fd4dfe24015308d555dd88975. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/FR9EI2400060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba82de6820d0360fd7430fe45adbf9557e22273377adc5d445e9e267fee1bf0. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/FR9EI2400040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x272bd499e3beeb31ef7c8105de3785b96ee02de789f7df001d95ffac9ee6ff84. 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/FR9EI2400050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe8ef3c2cc64d751021086deb2a2ff096c8c2f96bae2a5a8908ada924dc33d87. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/FR9EI2400070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbf61b76e9b58d2bd2b78c3f08031fbd9c9d3c433071af740efa133a25cc3eb6. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/FR9EI2400080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbc6f01e430e949cd2163ecdc9e4056745b928d25854e5160cab6b79b7e27930. 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/FR9EI2400240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaacc980996dca09168bf8afcfe12222ce96886334224e412fa878436e93bbe0a. 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/FR9EI2400330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd19a2535fe15d1de70105146f2ae43b63a0e01402f2aff4c1fdd77c116fd5d27. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/FR9EI2400340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5e777313ba43fbfecf0ae45d19e2c5e05b1b6d7aa61bc80b8ba49db2e845324. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/FR9EI2500350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba82de6820d0360fd7430fe45adbf9557e22273377adc5d445e9e267fee1bf0. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/FR9EI2400040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35757c800fc21cdffad904e6640879733327d065caab53f80cfbca5a0c13de9d. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/FR9EI2300120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dbd40eb56cd0e9de88f7023c8236574a4acc46490281d9ddb835bef11ce2822. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FR9EI2300100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x272bd499e3beeb31ef7c8105de3785b96ee02de789f7df001d95ffac9ee6ff84. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/FR9EI2400050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6ebdfd37903a98b379cad9cec3f7a95b820b176bca8c4770ecc90b35ca362f6. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/FR9EI2500020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87408a48c6ec761e4de00d1bb52e8945e9e3e3648424daa9babc5b566959767f. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/FR9EI2500030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c1fd5789df7bc0d2ac9af3becef52f0e14b879cb4b4e5b077d941ccda00eb52. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/FR9EI2300110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bf3ca465e0af7434075ae6a84f6bdaaad5cc77fd4dfe24015308d555dd88975. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/FR9EI2400060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe8ef3c2cc64d751021086deb2a2ff096c8c2f96bae2a5a8908ada924dc33d87. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/FR9EI2400070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c13204b74a30907d5aab44935751da6c8b539477741849285a4e25752e6de15. 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/FR9EI2500040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd25f9f90a6f35d622402f51ad18c768553218fb2dcb738cc6c76b5ac2edf7cda. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FR9EI2300130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42ffc364c08207d78550be80ea476fc900e63b9b5ff8bc4a3894ecbea06b2188. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/FR9EI2300060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee177b0bdcd1056975a58c67421bbce910a6c12dfb785a1c4921e0056012311. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/FR9EI2400550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbf61b76e9b58d2bd2b78c3f08031fbd9c9d3c433071af740efa133a25cc3eb6. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/FR9EI2400080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe00c912a6429b59efe239f7ac945c3f47ed9f765d78946c602f8efe7ae3afa35. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FR9EI2400090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83285d4f9d85cc9a5ca9deff37202c98cb71289e7f1188f3a880dac6ac1b90ab. 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/FR9EI2500060.