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 0x4ecd28d7dc8effb2062cb35c01d66f37a99327361533ad41df4c80fe62fc70c7. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c32a092f-4244-4136-888e-291d5fabbf7f.json and https://artists.proofprofile.net/proofs/artist/c32a092f-4244-4136-888e-291d5fabbf7f.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 0x2182bf4cbaa905c6f8746cbeefb2df87c7d8c6d559ba39ecfd80258dd107ec65. 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/CH6540832165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13b94b7a8c94c249ece6ec29b8a6fcb8dfab71c7afb2dec684cf5d837c0f22b5. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/CH6540832166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x386cfe48319180a979c92fa16feb22f4a9e21391cdfe8c675d570cf7dfb273bb. 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/CH6540832167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33fa459337a34687f896cfec3bcd8c5007c9b0a45e6b6a91bf9a2d34e9e7e7f8. 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/CH6540832168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x208ab75bfa663f2035eb4ac0e0670cf487e06d22a9b1bef5388f37bcbc8d95de. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/CH6540832169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca95c8f797de533677dd7bdb59adead5255e60f46b71b487038ed459af708a81. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/CH6540832170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c8f2db3875dd23f581ff119a233930f564ecf9b1e49c86edc84b2e1f88a5449. 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/CH6540832171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1ac6124f4d4199237663c7d334a5ca5f9cc5f8714415a68537e3ba5088aea38. 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/CH6540832172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d4511488cfdab4b03db823dc2a12a18a3da1f48359110b0e83b76d105ee4fe5. 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/CH6540832173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaac967367310f656ed2a653fd7f0bc04d49bdfc6b617399dedf3488ce599d0a. 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/CH6540832174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89868fd978110bcfd7fe50eac08c84b1ca64157e2d3fdea2f9a9c16e0fb55fda. 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/CH6540832175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f4ce0ee9a44e1ca4a486dd4359b94780f69799d029ba42ffcb294b73b1faeb3. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/CH6540832176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7365b5f00b293053e73e4b954acea0731363a8de99ebcafe7331b533548ebdf4. Chain 2 (Bitcoin): anchored in block 960177 (2026-07-30T00:21:01Z), 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/CH6540832177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68f19e8a93996fcf0f8072bfd00539549a6105fa1f403c5b4a3d35c931761467. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/CH6540832178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fd2371dbfd44f0a00dd3e13800e2a97b77318f2501e00a0cebdbec7b35a5701. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CH6540832179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcef31196933d13a266d1688ad1454dde18c6f29969365c294510e68ee99b09ef. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/CH6540832180.