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 0x5e5f693e8e5a1c409501cafb0c309cb8b1e911111968a1852fbbf2d00953ce6d. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e4dc03f4-3715-440d-8879-232dda7adf02.json and https://artists.proofprofile.net/proofs/artist/e4dc03f4-3715-440d-8879-232dda7adf02.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 0xbdb77a37653940cdbaddebf4f63cf8c496216ee1063ab1fa757b32331049dec9. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZTAU2423950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1beb2b0717575652916977dcb1734317113afaa1d8cb48bb88a20e39cb32c121. 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/QZTAU2423951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e8b106476db067fa527c930313cf07c25ef983db06d125716ad28f3061e82b. Chain 2 (Bitcoin): anchored in block 960223 (2026-07-30T07:51:46Z), 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/QZTAU2423956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb648ec7920b1f7955f4a8d93d9f1252fe766b17eebbc5ab2654add25e6ded433. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/QZTAU2423958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x764ef5cdf2838d15495fae321e78bdb7fe32620329e1866f1fbcd6204ffda924. 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/QZTAU2423959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb236b5f5b5a44b93f2df6efcce561c609cad366cb69d53524182f593882c604. 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/QZTAU2423960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1df2d686bec34cbbdd32073eb7dc78991634572f138253769e14a295d78e80e. 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/QZTAU2423961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb87c04161ab9031a72005fa59b5be3d7604cff756b9a1bac907913e0d2ae43af. 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/QZTAU2423962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99353d1aca6d5d4d94b60b9265d44700f777161be5b98d2991a202b3eccaf31b. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QZK6P2354278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a8e55a9c476e2fff0fb60ffdc866fccd90cf6c00d11434442abb826eccb801f. 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/QZTB42358377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78d11034dd1ea10f17f970277e04aa5b995209df5a3f5a5d1f6b639a02bf630a. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/QZK6M2351565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67185f3e854cb63aef3cfc10e0e0bf59e0dfa030bb5c7b143dc4c34d562ef9ac. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/QZK6M2351566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc947743a85534e1072770d0ff891cf25e85cab71b2ebe20cdff9c4fc4c2afed0. 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/QZK6M2351567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ef0671c424c542eaffc3fb308e34307145a1d9a792261c4a5da52bfd25fe2a2. 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/QZK6M2351569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ab822f68a381d291f10dd646478e05bef068704187cce1482dac8c5de3c1723. 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/QZK6M2351571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x148630b90e36cdb377cb028e0be188f46edb618054a346920c7c8a069b153562. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZK6M2351572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f2d2825405d1d0bd292821b1d61f1b350dfc07d6b2052fa738929eb572e45c. 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/QZMEP2154720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d026ca4e89a74b58169519aa3d95c15b27983f2994f9fe021afb60d81558c5d. 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/QZFZ62411087.