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 0xb87b9e1833e4b5e33ac35e4e2af2f972cdab73d0256c64b6fd958712a3b53a3b. Chain 2 (Bitcoin): anchored in block 953780 (2026-06-15T12:02:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d50ec9da-824c-4dca-9e0b-1701ef750956.json and https://artists.proofprofile.net/proofs/artist/d50ec9da-824c-4dca-9e0b-1701ef750956.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 0xa7de9fda1e1dd5f056267b0560cf4818a843c51069e89625ac9db695d92baef1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/SE5752452089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93237958097c5edc28c86b6bdf8cebe81d1aad33bd828332a926175f68e3bb66. 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/SE5752452090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb9de00a4e562033c0479d2c7db65dca364af2333e2652d3c86a96bf17140266. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/SE5752452091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x600d1116bcc8c5eaebe70a85aae1c8973a3048ba54829356078db6852fd27a6c. 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/SE5752452092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf0965b2ca47a16f2065f486e3cf02ec23d6ceb053aa0178dd009eaf034e398c. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/SE5BU2499960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9fcf4fd62a4c11931deb9c0a52b97b91d6dcbf2e9975afe66ea8119c7bc4565. 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/SE5BU2458195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797876a10aeae82918656a78fa9037a084cbcdd602986d9f1e06f58a1756c023. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/SE5BU2316743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb51b653fe0b28223240700422f98a3881f05852b089561cee06ba1847ee74e7b. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/SE5BU2316744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x073f1b4e59db213541294a10923ad8a4d44b418ef7cf31dda62250a568e1fe53. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/SE5BU2316745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac85684a25c63036e94739bd80314ea85d26bb0561f3a9af3a1672f8134f7ab1. Chain 2 (Bitcoin): anchored in block 957057 (2026-07-07T15:21:38Z), 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/SE66N2287022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54ba5c7d781fddacdbfa588eedad9522c81d31a5107241be23d02cf8ccf8dee3. 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/SE5BU2316746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb30d04fc8eaf4489fbebfb30989ad5a48ddfc9f723c5bd7bcb6fea2394239589. 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/SE5BU2316747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac85684a25c63036e94739bd80314ea85d26bb0561f3a9af3a1672f8134f7ab1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/SE66N2287022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf08124ba4c434043460e97c8e7ed0898d817b5bee8f6fdeab9a9003138530455. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/SE6XW2266704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26e458068df5e7ef0698f890207de07ab5cf2c50f26986bc7ef9e7edb2632bb2. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/SE6XW2205599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47532d46cd8e8bd7574ba34fba299291aaaa144643800fb1c6f187c0202324c7. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/SE6QE2259614.