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 0x5db40191008d3842473f0f479a3961a4ed565c3cfa9d2229b5b56566b6981e09. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a4d9d4da-94ee-4b08-91cf-4851ec25279e.json and https://artists.proofprofile.net/proofs/artist/a4d9d4da-94ee-4b08-91cf-4851ec25279e.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 0x364a2a7df427b8ae377d70e87bdb8c218d9bc9c9773b9e32b393b1878d814392. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/USHM21637446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x700eeb3dafa865dc14156eb63f890b3fd91300aa5bde8311af7c46f5c3b2d7b7. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/USHM21637458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x166fe88d37d85e1577adec8446f3bbd2db52f931171bb67cee64def2517645ed. 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/USHM21637447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e83d79e05ac5982d41c31893a8c495c207e30d6ca4f6c8c34d34e9323b67e8. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/USHM21637459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7422489fbb01f44365fa3c3526f57450d0248a8135eaacc469f78b72d94bf17. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/USHM21637461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafd1dc39bdbb2c808b6d708b78c0666c6537e0435fa1146bb11411fdae0cdc48. 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/USHM21637449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2ecd194cd1995474ec812cbcec1c222dd30547c0c35f602d77f5a4fce46a043. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/USHM21637450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65db9f328c1ead95fb4e5c029fc5c4ae132005cabf8c4d45c06d2da6b15232e0. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/USHM21637462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc615afc0c25f5f6c5fc0029a773e541879cef80959fde4d78af3ce544ec11e63. 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/USHM21637463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34d6301eca8dffd7e19b0e5a1b2ad1148982c877c73e9f659afec82ad8ea9646. 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/USHM21637451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49546fea411163d4d21304ed7f4a38e572cc4bfa46d67ee8d5aea30d0e712816. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/USHM21637464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x017dcab011779c768b18efd3181bd4e01af9bc62ed9364842ebe7e3a5aa01eb7. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/USHM21637452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb55601046460157aae038a44fd5833569e8924464a646c552fcb60b741d6f6e7. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USHM21637453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e83d8ce25724e11ccf3df42751122801cc3b4dcaae609965572d9bdbae78356. 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/USHM21637465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d8793833ccf239857fa2e57ca314eb33f7d19f0bf0b9d18eba5e29cf229cf72. Chain 2 (Bitcoin): anchored in block 958573 (2026-07-18T15:49:54Z), 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/USHM21637466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeb985fec8cf669fb00c4b6010937738cc8322c35213f4237edf2093335b8e7e. 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/USHM21637455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3732226ca3cb03f583d7897bc23dca14527d54e8463cae530af30423bda59c4a. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/USHM21637468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65636f7db2e9df8016f8a99a4ea2904eed3188f86deb13716c3bfc3d15021251. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USHM21637456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6abd30aa3154672cf1e1947f6d2585c0523406ec5b803bd82a123f92ec833c2. 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/USHM21637470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a7a48611e5fb9f6872fb9d45c26723d3cc6fece549147a501c7d62e9da6c95b. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/USHM21637471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd09f0c684029cd5102044b018a89848395c3a77c0179d5349c870214dce01091. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/USHM21637472.