thumb|Photo of a genuine Sonicaid® Sonicaid Ltd was a medical electronics company headquartered in West Sussex best known for its range of Doppler fetal monitors. The company also developed early ultr
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa53f6853c8285d1453ca9c50380bc349c299bf22c7e2f1385182a05019c44d6f. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/110d004b-e092-4586-b9a2-a6f07b89e663.json and https://artists.proofprofile.net/proofs/artist/110d004b-e092-4586-b9a2-a6f07b89e663.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27e45be5a6853bce0172f23139df275172ee4499ac8380ba1129633b32b3bcbd. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/CASD10500844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeadc806fdbcc2ee815c9edf434824f82b459c5dbd85d64486d5de71d1cb92829. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-16T00:36:13Z), 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/CASD10801124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x657da4f149299da0575316447869105e169bf2e3b21853e2f826b9064d29ceda. Chain 2 (Bitcoin): anchored in block 958325 (2026-07-16T23:46:54Z), 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/CASD10801126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8dd04721cb4f2f3d4534075646a92b75f85eac04ab22bbd4e77e1ef7b8d88f6. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/CASD10801132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83af7f6f83477e099678d7b25ba03263396d3bddb792ec2736c78ce00bca13e5. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/CASD10801131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x114f9d0b92d745d2e1e09e0e95e6e170a9d955047f6e950573a358fd0bfb44cb. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/CASD10801127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50c4d0e427390bd2efe096e2ceb01506ff144984223323b998260a046fe4c6b7. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/CASD10801130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x293d136fca1edfd641f075ccca70be013d1c4d712862d277b810e874da30abc7. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/CASD10801128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a07d92884296737b366c0c749e3c2ea7410c23e3eaa8f07ae6ece67393289d5. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/CASD10801133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb23688266c66f8480a3694e9109e88ec85cc488171b0f63a18beefd400ae742d. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/CASD10801125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7c3d5782c3f04292a462babf6ae1c663ec235b7071c12531325e541f865a3b6. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/CASD10801129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf689d9b3ddc7922caa79b6c36f35b602b684d40e6a138161537b35039ec9f6ae. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-20T01:39:56Z), 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/CASD10601677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08c630a0dfae0638c38591e2cd9c8debfbaebc5f0ba158abc7a79fe7b978efd8. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CASD10601681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x135e788f0ada4e7ff063e961f0f278f95e1ad8667f601e9ba6a92804f8753aeb. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/CASD10900610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f41e9a7fabb188d72e5a82c8815382c9203ac729291e1d3c6ca1af7aca9de41. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/CASD10900611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x435f48f60238e35328516f1b07545eaf904c14037e27cde10205543ea92001ea. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/CASD10900612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56bf94fccebdc1a79fa40b4606c5492d0a0da74ba59f63cdde2f3ddcf4aaed08. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/CASD10900613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b047c3a7a903b9bd68089bc16f173cca97b50b196ea07d8ddd883c0b086e5e7. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/CASD10900617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b54d794b8446ea5b634aff28e4a381357fc1c2493abeabd3efa14f30b9af1a8. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/CASD10900618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d292fc858fe525bc0f220f38195c75bc32f47d53e84559f0bf9cbd133562c3. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CASD10900620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x837561911d4df1594336ae6867b9bffef5808998b7ac167a8f014be1910bade8. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/CASD10900621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27e45be5a6853bce0172f23139df275172ee4499ac8380ba1129633b32b3bcbd. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/CASD10500844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb853233d66ddaf13916eda7b5e717a0ce401eecd1e650b899e98cf4a208e868e. 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/CASD10500846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b3175ae7fcf0d493af63be4381420e409c63f44615cfd3c6b043789f276a75b. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/CASD10900284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfc9db9d36577a1aeda4126dbf8685ba6856d87de862bb6e283de890376d9e50. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CASD10500849.