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 0xa611fddf19d7bec31d34d44f1fe3acb0b8c0a4075cb03734876c6370e09f4a07. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/121309a5-733e-4a7b-af06-2fd257eb405b.json and https://artists.proofprofile.net/proofs/artist/121309a5-733e-4a7b-af06-2fd257eb405b.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 0xfb48bc67f0e58a706235ff87ba81c3f51b51d217df50cc3bd86ff0df68156d12. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZTB22437036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15ae2be8097123d836cdb3cf13abbeb711f1ef7ddd7f69c4b05d7598f2b57cb2. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZNWR2424501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e38b6b7c310922412a2aec059c72bbe227bfc14ca8695f05470c92703238770. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZNWR2424503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x410eec6c31f1ab5045b5dfce57e71c81221588aa97e8033b8b4ad8dbd1b45f1a. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/QZK6P2497118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a306f5b569715a61fdcaa2327ddc78bbb00810f07c7ea8080214eb1151a4f99. 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/QZES62407661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c2cfb72ffb60fcc6a44976307fb05b45c8303e70d1754c656f9afb7cacc33c. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZFYY2432149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x050a144f476dec2ec7433850cfe5c6d83f74da77234493c7aac4b0606b02cb5f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFYY2432150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbe42541b15a80a1cf2d9ed2d297bdc52c96483f6a9c7f6faff820b300620cba. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZHNA2530242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3bd90ea26db64ea3ff2bbbcd903e155058521523f119cecf47f6a9d8c068b2e. 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/QZHN52532072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeef146f4647b4b714d6ee138c8879bae95b5c5ac9fd4ae23ab0a1dacb8a05add. 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/QZPEW2526824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e7949ba06c5f9593eb5640ba899ebfe2254ee4284d1503b7b2c62b49eaeb6ec. 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/QZZ7W2439403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc942f65e5700b1a858229d784b89d6e1f62e5a273524c725077ea25ac73d31. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZWFU2465531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87113e71d89fbbe32e907ce6f5b00fbdbd2a83c746a83a1e600e88c43a6bc263. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZTB92470598.