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 0xc58b71b3dae78e83dcd55a215fa1ea44b65720053bcc7bfa803a99816e5c9013. 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/1f9a88cf-cc99-4cce-8d30-fd26fa561293.json and https://artists.proofprofile.net/proofs/artist/1f9a88cf-cc99-4cce-8d30-fd26fa561293.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 0xcd4032a45e571d0970e6ab639de5609eb1c73d149b31dcd1234e2ef40cd90c01. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/QZTV32453444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b3d4b571b1ffea7aad4ebb8bf57d3b77a321f48a124c3bc3f58deaad6266092. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/QZTV32453445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e2629c7c5c8c90195493daffef9b26bc4857d0198b499c88d5bcd21016eeece. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZTV32453446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe908e133d8a0a8ac9f2f3c3cec855c27821d2abfc9de7d57a9fb164336986ba4. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZTV32453447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a3526977399ec684aec75fe88ecd4cfb8f76b935166a76a804197f548c9b158. 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/QZTV32453462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1230647bdd9a2c6c2529b6192c360cf50fa96c81e2d7fe8d800eb57f8a79f21. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZTV32453425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfca30b05abe9aadb44ac57f445aed3ea6de7ceb984548272456a83a41412880f. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/QZTV32453426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ee32fe525bb8edb8e007bdc6fd1b44eaef431b76b6f7fd63b66fffb7b7de4ed. 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/QZTV32453427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f0f60f919834cb75c591082d99ac17e16efb7d2f099cddf5f5f1a7954300da5. 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/QZTV32453429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bbd6d4a8893b86c198b1688a95b07e64d748f22805c7947b22c09d2565fb62b. 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/QZTV32453431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x439ea4a64a3ed8c2f59cfb0bfe68521b8ba5625c905d9e157a8594fae74d186f. 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/QZTV32487011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x766017cdccada5de7788ee01ed37e5c03f5fe1e589d1f6a32473d25c15f020c0. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZTV32487026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1fd25af32d25707073acb2a7cc298fab55fd95bd28cbbd547239c0361ab9445. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZTV32487021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbde156ee68a13ecf2e5631f917e54acfaa50628a68636d22ac1dede42ee8452d. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/QZTV32487023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81f27992c86687641ca9acdfc76a2cecba9d39ce0a462ab5b9177d29ee85bcf7. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/QZTV32487024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2ce822e46c09292c4d396cf5302a60878c4f21108d687a3e04362687d1a753b. 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/QZTV32487027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x158f4e79c8fe1c4c2c80ee388683a8642ec54b637b8dd071c78161a93b9c4d36. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/QZTV32487029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc3087f084eb6ac6e461218e0808df09e10dc4ae4976e14305996f91893a7bc8. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/QZTV32487032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73c675940b49b08293f150f122fdf77dc8a4f679c800bd22fe941d130a3acd8c. 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/QZWDD2484501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcea9baa4900c3a5bd984111b73a4691ad8d151fec8dba33ea48cfe9748eb9a2a. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZWDD2484502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b7b14ca034c926b679ca314e24ffe976bd5316173d2f73f39c5f9be3562c6bd. 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/QZWDE2433676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba31d7dcb87ee4bf9208d47f93b1cc3df9e51c8950c7ef788cb839cc96e8fb63. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZWDE2433677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb21dedf2fcca9ca620a47d0090e01ba2586f57b8c9f415f3bb0290f5078eb90f. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZWDE2433678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67a03ba15416dc06878c059c083151278e72e67935d638d02fd377b93fc00bc5. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZ5FN2597246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63d99ba9171d177d2004f348630ee28a90d59a99fe7e06be78b8e0c7ca3d5cdb. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/QZ5FN2597248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacd59a03e0f0620fefc7c771d9731ad3f5bbeca3d690bdd192a1f697a28b8615. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZ5FN2597250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95cc7b0afc44101eaf0046a1f5d08c30618fc839b4827b30f5954be18298e4b8. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZ5FN2597251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf776c28ae9a6b08957ca7ae4b1824d8861557ceefb7d92a17207d8122af8907. 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/QZ5FN2597234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd411b52d2aa2058dab47b813d0a097bb23558f461ccef3aad22a90e892f950f1. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZ5FN2597258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb35a4113820db76a43a2c11e6e9eed63bd81327751fc839e261890eac92c18c. 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/QZ5FN2597261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ef93eb91f89520015ca27a451ab718622c4c04db269ff5d054141e9a5f509fb. 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/QZ5FN2597263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c8d13e8adf35e2908f0b88eb6ccfcd86370d79304be4ffd1322659dcce21130. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZ5FN2597266.