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 0x3a3b87c763760e8e586227a7c02201dec77cde72bb1ce3daebfaef6d137ae439. Chain 2 (Bitcoin): anchored in block 953588 (2026-06-14T04:52:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/01400fbb-3929-4277-88b2-502a654ca467.json and https://artists.proofprofile.net/proofs/artist/01400fbb-3929-4277-88b2-502a654ca467.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 0x3d891fdeea0cbbd756870fa97b6942ca129e247e96ae97905629edd85f07f596. 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/QZDA52082202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4212e555ebff79703d25ca1ba11f5c0f171b5bf4e3e60c5cea34eac7f0bed79b. 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/QZDA52082203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fc0c6b5962d14480beaf1e8dae40694d32a5521cea92736457cd4ef599f086f. 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/QZDA52082204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb85ffcfc35dc8e10c57526a2cce3ce31947c26367490692cea6506a4179f051e. 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/QZDA52082205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce65d649850ce9aa4571976410411c0ad4933f67a5898f05c4802f600169bca. 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/QZDA52082206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c7746ba1439402e2c34c083782c78cd343a97dbeed26d1bda9fc4433ab39be8. 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/QZDA52082207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c78c6426a2705f95679cc0a6ae8bf538f02d72cbc40166ca001b359c69dc71a. 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/QZDA52082208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea3b8b5bb77ab14ccdae4b38d7bd94e4e1622c27d5056351e1b1b0631b662bb6. 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/QZDA52082209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf00e995d3aa8f4318323dc2f8c90afd87790c9785f4e6e66bcbfb2fe2b0732ea. 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/QZHN81970908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3354f5e56ca9156ba9370fe4ff891dd9839c23075f80273c928b6f781ea096ad. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZFYZ2012602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd1fd25222563013a10214275556de657b579606397325c34408c82f1332c47c. 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/QZFYZ2012601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8908d001ffa69574d87a3f112bca10da63cd95f401e5d94538212e621adde50. 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/QZFZ72059668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x786693921cd7c9415d45089cff068c13634d134db0e56b0c76c20d6e7fbdb6d8. 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/QZES92049487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa49f3e2edde9194d2736682b05267cf9f9911b80bf93289b5ebdc779d2ab0b24. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QZES92049486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35a6f5fb60c10575a03dafc12918426df66ef6809fdd92ae50e0e208110b2b5c. 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/QZK6G2017852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa350d84e51735cc14388f3d5d6e700f719c6a9162ebd7aa5ac10bb8bdb3011ce. 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/QZNWQ2099418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b00ea185dc171c62c0847f12cff11a58cdffd60eb20b4e2e529e327ee6fc126. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZDA72164912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3a0b2b39c67f862dceaf53d34b86f5ddd3edc58b2506bea37b17e615b4b256a. 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/QZHN32173209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b00ea185dc171c62c0847f12cff11a58cdffd60eb20b4e2e529e327ee6fc126. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZDA72164912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x674e75d70a5504ed52d1b88af4299398ecbad3dee5d0485c357ad5ee88da3adb. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZDA72164913.