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 0x6902706001104ca0690a68b3db7cca2f70d2878f008e5ba81c6537d33e68ba73. 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/929e8621-5453-4236-8734-31c3c8847806.json and https://artists.proofprofile.net/proofs/artist/929e8621-5453-4236-8734-31c3c8847806.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 0xd4ae37c5e0e520e891c8e9de5d4c15b18d477c77ab4ff5254703515da6d86ffc. 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/QZFZ42360965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001561e704e927c73cf0f63bd711091f66013471a342f28eb5b4a38f27291fcf. 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/QZDA72322830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58f113efa3460a2946e5f2ae00c3b6920cb60ac2853bef6e9586ae9fbf917f4. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/QZDA72322831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02a092a1f94510e8cf685dba12192c92c73eba323856647723ea60018657cda0. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/QZDA72322832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a7bb0d32f969f433ca5f364b3c5b5f43a8394ec6ee5765ee6ae2277c8b37469. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/QZDA72344503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2f902cf4394087c6125d1dbe5875a5fc95813d0b9327b7f1ebe35b6ab1b4de. 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/QZDA72322833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x129866a1648d65be419fdd9ea1e8fd6cca030e850717b0a8757b954f5f1809b7. 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/QZES92362107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc143f23d01f1ae35e6d7d126edb6e4addad0a18abee6464a166a8203156ed62. 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/QZHN72305454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbfbcb6395c5eb20705be38ad6aaeb3d52cfe05b52213ce3e7617920a1d33cf2. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZK6N2350835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14ad8db8eac853a406158d884f7be20dadc00e5f2811f91f0c4dc33b000b16b1. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/DGA092335000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09efd0c843b53b1cefa3750bed4be2056f908f6ebf36c5ad6129c5bcf8633bf6. 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/DGA0L2350409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca6d2b69e825175d35c5f0db3984345cedf996ece0f3ebb026ffb410befc1fe8. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/DGA0L2397175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f8aef95d22c1333ba1f585601c2c6d95c0ea8079d78c4230550df025aef6e7. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/FR96X2435451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf934de68d0e46d49e88c115af11e48c6acafae38515705a8c8eabf64476071ae. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/FRX282411201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x496ddec008f0281033ba09a2fb0e52ac1bc7f8e8a97d3704b3c4c09d8858c052. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/DGA0S2410878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e2a44d304ef39bf1d50be7d4b11e83677b7fd6e39db3d5bc191bb5609675b61. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/FRX872529752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x184bdf77ab903089f2252db7bb355b4a4ffd89a55b41a138e11e652d81341aa0. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/DGA072383887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd164852051e6b1b6b3ab5b729ee0fa9c887e7c979daa78acf08b3d228eaee659. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QZES72396996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ed42e3b5f2686fdf2b1fcaf436d567153ff51997906e7ba835ff4598cdcbb90. 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/QZK6M2367919.