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 0x322ea81c260206bbaf808a0dcdd7898e66c897000fdac266b80034fab399f0dd. 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/28fac725-aaa0-4a1d-ac99-ba34b5fd11b1.json and https://artists.proofprofile.net/proofs/artist/28fac725-aaa0-4a1d-ac99-ba34b5fd11b1.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 0x355f302bea365b1cee816f51726f475b00f534c20b9611e8910ddffb90d3a809. 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/JPS801946567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbca2b27015017355feb102cf55f106cff3f459c080926cf76a93aa2b9131c36. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/JPS801946568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ae1cda45232b90c2ef56f7bd11f752d298478f1e1d8210bb96b3a48c37cd6f0. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:05:14Z), 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/JPS801945604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cca9d0d63fa2c8385bc482335ac698763f901527d7a467bc1ad859ced76d3c6. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-16T01:42:23Z), 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/JPS801946569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x526dfba8176fc4d84544e6eeedb703ae3a5722c0afd7e00740f02b2c766fd4b3. 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/JPS801946571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17d62c6bf67436eedd9dc82ba097088979c517854608e39949c1f75fd9cb4713. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/JPS801946572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbecf5b8eaabc010898ece8094af9138f996a27aa322ac6e77cbd9e76ad72fcfe. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/JPB602162397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c91539324f8746d2ef6ae9e5a06fdc61255042df596abb6eb88fb64f6aba8e2. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/JPB602192680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eaddbe655c51eafe7f7546546dd2a82336cd882c7414c7806d8e45849eb4dd8. 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/JPG102300671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9e666f7a333a94eb158cc22d695c39af8e264e17d6815b4eed9f80a857c10fc. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/JPG102301163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc12ab528a88874730953ef506fcc9eac9dc672251a6d3536d64e8da91fbeaab7. 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/JPG102401513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06cf37efa9deccdf95bf2920bf1d89f6853d705beb74932396b701f0583f07e4. 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/JPG102401925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x022fc27aeaf6c18e46712d924b872f5fcbecd7d29a6007b73981eaba8157dbe1. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/JPG102401926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16ef7c360d28568780d8e4a16823b871af85069ea298dde1699ac73ac5160dde. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/JPG102401927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27276ff785297cc89d7ecdb1f09ad826f1eca7a62f826e0e963cc7abb86751e6. 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/JPG102101451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63603fcb1828984fe9f5be8349cd249f748e1881f2977301f3d161c7585682b1. 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/JPG102500994.