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 0x51dfd681fa2c36f9ea44d81e6b2762a6676b1edeee7c0cd4c5035932190afda0. 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/9b652a5b-63a0-477c-be27-15f7da392784.json and https://artists.proofprofile.net/proofs/artist/9b652a5b-63a0-477c-be27-15f7da392784.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 0x267188a7ec450410d6d094aa6cfcf9577d985fb1cf534373c7f3bfeacda56362. 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/QZFYZ1978810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74aa5bafd15c978409004c31d4cfc075527441a19ce5bc55b1c015f688210e0d. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/QZHN61977591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd33b566c44d275380db8f537220c37154549c2e71c9e799d5d0da295882142a. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZFZ71921787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecac565d47955b6b81bb5b067c1557b58c21444ca3bba57d53c9cd5a549af339. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZFZ32093569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51c7ece843b6b7e5a6b604fcd4470b4b9a7ce377cd92cb347bd2483b42885831. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZFZ32093570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x049a46c3cf25cca6e67d7878da97df40741c7b8558ef875a47554ff9c6f4e949. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/QZFZ32093571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a2065d1f76a0db6063de32be64535bf16d79071d505550a6bd912696a783232. 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/QZFZ62289957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31c61a7d1dd63f8ba2200e11de8cf9b216f27f66752fd44f2b438f0fbdb2a8b7. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZFYY2366687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9a73bb28316599ca5bb18f0f9fed58620c6168df668b3f01e9b1afb09e06b18. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZFYZ2439838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4842fc4c4012c7eb4433289fd803c364f5c25e445b65a7f7a1fa5b86b4ca40f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHN82464944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cf2f171d5ea91494083d6797051986b229956cd5611c9f7f428d4d5a918360f. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZHN82464945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0de7b5562c0eaa5223c8b4dc89104f7284a0f9f25f10d283a59c58e51173f83e. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZES92438388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20dbbcf749a298d435bf2bc14a1218a4cf9f3459feb6d98e9e3c24e52c29d5db. 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/QZWDW2583386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x056133635e807f27d900d729886c943fb10b1d6d1f0aaff47265aabb9267b835. 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/QM7MR2000791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12f0e2bc5d4f3ded1117eb51652a126364b40005cd54cf79f4937cbe0b42fd32. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QM7MR2000444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fe7ecdffd2dc08647857cffb7f73ae946688ddece2a24989e438e56774ca817. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/QZPJ32104124.