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 0x157a7dc2336e4cb6fd8c4c42c58403cee6439f9dcfd6c5703ad53ba88fa4e35c. 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/04c7dc4e-fc8d-42ce-9128-bc6f67d66191.json and https://artists.proofprofile.net/proofs/artist/04c7dc4e-fc8d-42ce-9128-bc6f67d66191.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 0x8ee8db3945d13f70f0dc3c2bfeb2687096843c31d3acc59e5f95aa45ff962ab1. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NLD681804675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ccf301a879c6ecab0e8f5591d5201228f7cdf7c2eddaa8bdcf1b098e45a7be. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/UKU932256956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4717e794da919595c3d07b84064dbdd6ec41a71a6fd0ee1826b476e0547e7222. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/DEGA22203731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf82f0564ddbe381fe1475040d781c0e1d07c8a67b270b4a474cebcb5117a6306. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/NLRD52352464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42f4c02234631b40ed7a5d6fe30a9ea818c4f4fbb9103c0f7a608e3ea89d77de. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NLRD52352486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50c90d5538690528095b2abe2b5befb7617b3d4847d1a04408da598dab2edbdd. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/DEGA22504367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84ac02578f587c6bb1d7bd34c219c99cdb4c092c5aed3a4ad7bc2b3e00eec50. 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/NL3M12500030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x664a3d84a95c89538be91b52644857cdda29441592dfe4716b4743c832fa4b9a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USNFU2000010.