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 0xeab9cc849f9323541215fd3ed997c15984941827c525fbc6d5998191f852d60b. Chain 2 (Bitcoin): anchored in block 954035 (2026-06-17T02:39:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3ca4e8f4-a801-4fa0-a747-ff025bc2f969.json and https://artists.proofprofile.net/proofs/artist/3ca4e8f4-a801-4fa0-a747-ff025bc2f969.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 0xbdc54fc30579ed2cd5d405924e86a344871efef77d0a27db5ecce452f8279c66. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/NLHA72200026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62ae5b71996fa7fef5919be5736639a72473bcc0b22f6c54322b1ee132a9983e. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/NLHA72200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc50d2e114d6fdcefb014570a592202e889e144f2609f8b824e16e308fe85207e. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/NLX092200106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b2d772c598010e6ac704a9eaa7e863643540e08fe5778ecf1d59d884f70406. 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/NLX092100095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a0669ae7e7742454fbf8d39ff8348fdd07617603e7036218bc88b698ce4392e. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/NLX092100081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x411f7c16217ef0e13019d4b15e31a05ca1d2285e8a28e1d2a5c6f9f5afcfa5ca. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/NLX092100048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2950ea0d5ff5aca8d3e6b544d902704437cce36546e4197c307878b90565026a. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/NLCN51800041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1b23b483a5a6a44affa956d9886bd124e73f523d9343ae0cf1508ee96288c75. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NLCN51800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7241936c7783d3d41149f2c7c7cad7c43ded383007daa5976efdd982a33e2c1d. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/NLCN51700014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b22d9f826369d30e7352d6c4acd5c9ceed7e22443fb4ab519a243c4e875d2d9. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/NLCN51600021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd193c53d954ce77478c677e58a0417c3c4b1a29fb820e906eebf30ed15e2de84. 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/NLCN51600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x863c1bebb1702bdc36b0f628072b6b28ae20e94e91dcd324b39386aa4ef82996. 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/NLX092100084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0024c993871ff0da4b57b761042236f65d6e6a17c41e8c1bd6cbfbb1f5dec8c4. 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/NLX092100049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb636e7748a055a68f67519a1ec5aece6fd5e2835b8f128a749d9d9ada187c490. 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/NLX092100074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5accf8cbda1d6f78597f376f93c1af9baf00d1975eddf72f26ace2ce4e1b1ea2. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/NLX092100078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc094a9b80c22fbdb11bf82665a29ed485aa277b92e0f836591dd23a6bcf73a7d. 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/NLX092100088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc92b8893f088c096ca20f1bf6e01279da676b0b353c3edcb8b0c9b5403b7ee9. 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/NLCN51800037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8da84b531447b7900efdce4dd52d395a91b740ededafc63bc1b0e6984f93c84f. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/NLCN51800038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd912d9a017ebb83686281653269447bb67b004d5a232e3ca5e119b44f2f985e5. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/NLCN51800039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x482f794960608cd107240736e889d1677021d62819dcc7633a15a4a9ae07943d. 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/NLCN51800040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2950ea0d5ff5aca8d3e6b544d902704437cce36546e4197c307878b90565026a. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NLCN51800041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeac68ed84d5609557c477a2fbc97aa10ed4ded0980fa82512f56ce361dc069fa. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/NLCN51800042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed5b10bca35d765057f6f354a799b38d8d8e38f320703747904c3dc4578119d1. 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/NLCN51700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f1765d33d9697f86c49130751ad3ee079ff5261042dca32e7df33e0a114c8b4. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/NLCN51800044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x864e5d20b07be403a9089e84fbe090954b1e0190482f379d314e035199cb1c36. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/NLCN51600022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f5d97f9319ab384b37219472e17991cb0f7929e1b9a17bbaa32ddee92d1cac0. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/NLCN51800045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75e539fbbd6f5c9f887cdc8d6971003b755f15b5e5d1bd70847c8bceb29e88d3. 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/NLCN51700061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1b23b483a5a6a44affa956d9886bd124e73f523d9343ae0cf1508ee96288c75. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/NLCN51800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5cb94a96f8a8a8833e4a45d8136e96c1fab693ad8bc55d680243bb68a73127b. 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/NLCN51600017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06e2f31548760ef0fb9f3dfc7b4f0891e791222ef7fd4d0beda753a2448821e7. 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/NLCN51600097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8660311a0b6854c8b14b6fc22b010183afd13e2d4c4dbc64d46bec0e7e80eeb7. 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/NLCN51800036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1c8e2fd3698d27f98427d2d01993eb37f36f847784ec9f1fc1ba8ae45f828d0. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/NLX092001122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb097dfbec329a87b93875bf9a2563e4f0de1a5a741378c1d2ca4f36a392a7151. 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/NLHA72200046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f01b6797e64968a018a2f524670a61ea0578c5e0a930d705fb3a29d5f6d9a47. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLHA72200106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d03d5f32725289b94c7ce2bd1e955782e1701e16aad3fdfd83c5afe05abc0ed. 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/NLHA72200063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bb514ee2aeebcfa4dd632b9b63606e3ad9ea36c80ee82c2a9fd4bb12023a4ec. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NLHA72200115.