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 0xca2e6210fd0d1c8ef5589c04f7b3abb60dc15805d035d26941d9ec4e3dccaaa6. 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/cc7783a7-3e49-4487-be84-673243848cd7.json and https://artists.proofprofile.net/proofs/artist/cc7783a7-3e49-4487-be84-673243848cd7.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 0xcb5921b218fc16dea1742443b3223765f6e1d670020c12ff9586a0201a9893d5. 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/FRS182115308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8feeac2072baf665379c9c468835dd23a0ae4eb9708e83938592e3db3e49aed2. 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/FRX872200358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e13e1075050170ff62e16937fe10f9bea1b0c9ec6213bc87e014eabab18ab1c. 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/DGA072347933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00af4b976e0e680fb6b22d32aa4a214730ccd7cfc4f3ddf3e5ec6010fe80dfb1. 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/DGA0H2337085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00f07f2101dcd859ec5c2257f164b3e118d9e0bef53f1c148577ada6a6c63440. 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/FRX452332506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd27da6817b8cf6fbc4a6e5507b257af981864390bcc8c833ba608c1a516258e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DGA0H2337086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8feeac2072baf665379c9c468835dd23a0ae4eb9708e83938592e3db3e49aed2. 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/FRX872200358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x503026ded70faa6cc2f5c2f86a1eda9bad4301dcd734d0805a63a842905e74fb. 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/FR2X42347718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28d62a7a97534ca96af95d696f2a5308624e4ad6c3f74a3aa982e00bbe08f752. 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/DGA0H2337087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87e76505016b6a20c7e55e089cb1a9b942d87242f4b74284f780d6e932886ee5. 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/DGA0H2337088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x698e93e983ca3721b923cfa4ce5834b50081f106b3ce00d3f49cd73850350240. 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/DGA0H2337089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7470ab7ad6512284011bd164adf6944ec3d2146a88af28c66cf2a06006ded455. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR59R2200719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e13e1075050170ff62e16937fe10f9bea1b0c9ec6213bc87e014eabab18ab1c. 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/DGA072347933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97a5618d6c58731c5c6babfe701688e89fe828022473c981a3599c1ca968b278. 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/DGA0H2337090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62dfed2aad12006eff75a0b4848bc21a7833a3effefbab871d3eadc5bcb5c9cd. 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/DGA0H2337091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc777e38d22fc5647f8de514c249a24e6a5c2c77ab63a56a0af0ba35aa11f15c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FRX282489450.