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 0x4abc8569802219a00e7df6524d649f36bf8adcd1b6eebf5c0dc45c3c2ca409a3. 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/d8a0a326-d1e0-4e23-bd80-e80249cf6d13.json and https://artists.proofprofile.net/proofs/artist/d8a0a326-d1e0-4e23-bd80-e80249cf6d13.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 0x754e115de38f3aa8d6b472fbec65567267b65ea6873cd34322edbcbe526dcc4d. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/USDBB0605851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x439833d60778823458032394194ffbec7c5e731d136438f3565db804d5c89361. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USDBB0606439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2170ecae2326884790ea516a00269627f384ab061e59302f2da10c1ee73b4e8a. 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/USDBB0606825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8c0c60e59a42495df30ca708c002b69c2cccfc2da4ae281dede14fff44194d0. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/USDBB0601093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c0051ce13b9e68cf4ec7e059137dfd6c4cd3bb26465b2a969a3397bdc8d66c. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/USDBB0601540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba4b24129870bc25e03c18dd318e9ca7907615eb3f55e7444bfa62de7b1b6318. 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/USDBB0608359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x756b2593600980fcbc6fe2b86ec17ed5d2ab19c4b2c6fd0191a48df53ab516d5. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QM6N21768273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e5a0c4d02d3d039fbb79e0cdeae83c7eb2d491dc880be569b920028c4d34d0b. 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/QM6N21768274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8806a0ea8a455a781fee18f00f23cf6c29e5282607186d2b143ad07d69ebcdab. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QM6N21768275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe476e7109d9fd74f7583baf9ce2d321d155985be25bff61301a60bcce24af10c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QM6N21768284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04ccccb0bad25ca77aac44fdfe2d14dc11bf07114927b636d52ce3c5aba0e4dc. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QM6N21768287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9383034b6f7e85d441b5b4a12cd92aa71959d80665b2dcf9f8e82d046b1ca565. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USDBB0602021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d12d1a2a611d296729bfd85d30d9eca792a757295ce9bfeddfece9d6a4407a9. 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/USDBB0603228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0ab1c44bae0d7ce781f82a4baa7e0abddd9080dea797528f1bafc6e9e9af3ab. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/UKR6V2342732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b7aa83c03fff4186ca0fe33338f2eb716ca8be7fee4cf8878d8258cfe3d8ec0. 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/USDBB0600300.