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 0x8935734118a7bde05b3e391eb32b50103debe59c0bce0b94272cda91acbec925. 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/0cd9aabb-e891-45de-a2b0-8bcc5dae90ce.json and https://artists.proofprofile.net/proofs/artist/0cd9aabb-e891-45de-a2b0-8bcc5dae90ce.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 0x3dcb0987f716614534c0ae4d1e23f84950303843ef6f44d423932b4b027e9adf. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QZ5AB2204630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f574c6fb81ae629d1832adb90b61ea4c62c4279e8983d660b8d703655f3ed62. 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/USHM82080629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee54d16624a68373efb307793d9cd90b155e246812a2fae4677249f567236ca. 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/USHM82080630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab5b1b5f5bea3c896c5b4ccf1b2f6bec67b0b1e2f10f7c7080ff57792edab25. 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/QZNJZ2121236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5dabc4291a99fb2241953752f92553402410534f4cf0ce0c07cd06124946d20. 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/QZNJX2153564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01cb4fb66caf40341d6ff9dc2e2f49e2b65c5bfe3d473cf91779705b75a42ee2. 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/QZNJW2117178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4823d539dc53ce09f032deaf10c710e5a1fa68daa9bb703bf0000024bf84522. 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/QZ5AB2204631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae1d76cfdcd79356ace5b0728f3ec6edab161ad7dfb2030e60590ec0b3ae54a1. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USL4Q2018132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81db85be47f7433af18f820f51a3577b2404039d92289608304dc302134e2e91. 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/QZ5AB2204632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5381aef7fdc42f75117690c4892877ce09d076d2c8eb715088eed27c91e343a1. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZ5AB2204633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6396b579f5231c5acc3dcaa0ddb6c9cd4e32450155313993fbad62ba819732e2. 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/QZ5AB2204634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e4d36697bcddc2d9c19ddec3984f535dfda469af7ed93e9a58edd255dcbfead. 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/QZMZ92120193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4909d87adbdd30bf6234f9b9ae19b830e01e1e429d74fa3c7515c795152b55a. 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/DGA0S2429285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eeae0f69d8106fc7757d7349d5ded8d6007f61a03776ed73ccbf038fb3d5381. 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/DGA0H2482045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbebb10c849414d17be7e28810a95cf0349c71fccffd5c4664213695a43c000c2. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/DGA062497125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eeae0f69d8106fc7757d7349d5ded8d6007f61a03776ed73ccbf038fb3d5381. 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/DGA0H2482045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbebb10c849414d17be7e28810a95cf0349c71fccffd5c4664213695a43c000c2. 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/DGA062497125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbebb10c849414d17be7e28810a95cf0349c71fccffd5c4664213695a43c000c2. 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/DGA062497125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0be3c9ca18c86816bf1a55510b380ccefaf7708bf45ded270f9c9fddb09e3190. 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/FR2X42459115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x157d0d42802678329cca36f9f948cf749b98af7212fd36c2b0aff42f958ce17b. 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/DGA0P2354729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7384fc8b7a4415e55ccc147a2940835eca455fb102a67a88ee53a357e68066b. 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/FR2X42459116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9934a160ed80e6975833bc0b2766ea352d10fffc66f96b5f3cea6f906b5dee7. 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/DGA0P2354730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe176cbb1800b3e17cbdeb1912eed900fd08f81712af2fa30d602aa3513c7d2c. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/QZNJX2291988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab5b1b5f5bea3c896c5b4ccf1b2f6bec67b0b1e2f10f7c7080ff57792edab25. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZNJZ2121236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5dabc4291a99fb2241953752f92553402410534f4cf0ce0c07cd06124946d20. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZNJX2153564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01cb4fb66caf40341d6ff9dc2e2f49e2b65c5bfe3d473cf91779705b75a42ee2. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZNJW2117178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7cdbb544bc3e695b4f9a67a5698f0154989102ab9121bb3da1e8124669a75fd. 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/MXD781902472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a28ea9d85f6c3d183ad0c853ff3514bb0ea25da82ab0bf4a56df07d32eeefe0. 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/MXD781803096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8a2a1fde0d4795db52866509c6b17e9710b8d4d7f13b25c2156ff18467a1590. 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/USCGH1832385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9518facf332fb2a8d53df8e455e14a1d1ac60a7bfeaa5b3807841662de96d89. 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/USDHM1714130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb35b5277eb523bf9ad632d7a437a83acacaf8ba0b2b77e0f8984af40be23413. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/USDHM1710508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d593589555d655c7d08d51624beb9f07cf11ac0a4ce3a807637cfce236bfd4d. 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/USDHM1705607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eb57ed70ca60e69bb1db014ddbbd285c779b1e5de521f813d185bea2bd62e19. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/USDHM1615882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa54977f59c45d8a697627f32ea781ed2ac78527cf9401f4614f7ca1773425e4f. 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/USDHM1615883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36c1c4bcf517431f7472785c21acd6638bcee34e4dbf10c1065cf44d1821b409. 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/USDHM1615884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba141028d5f0d56f99ac302aa0199c42d59c9e6e1b41059c766f0de2d313dea7. 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/USDHM1615885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7fbf351262141964c830c8d1f46562f5dae22ce94c619a0ccf85bb71ff50137. 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/USDHM1615886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38408823acab67dd1978b732e26edb7601be9e9b8b64fcf6f7e69f7856e777fb. 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/USDHM1615887.