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 0x453f036d86f8da55b08ef1c2ab461a284cc56a44ee7e0f1e22fc35c056184e09. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b63f586f-b56f-49b9-a5aa-8cf4ab62a3b4.json and https://artists.proofprofile.net/proofs/artist/b63f586f-b56f-49b9-a5aa-8cf4ab62a3b4.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 0x19948f04c90524d12cd71f5a1943c60c923f4a90a836df411e43b4d38362116b. 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/DGA0P2405240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7783357a1cae81a49d27ab6a76c4b0a8f2652670bc3026366aa67ae301385c40. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DGA0L2458303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe0351bacfd7f50dc04a7738cd6331879c19debfd9f4e532d58b0740134c6767. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/DGA0L2458306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b074828606d4d8d18f2ef72e2565a9cc1a52d3d2032aa3d7c143b88cd1e2c1a. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/DGA0L2458307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde8561f504925d8b40db46eeff8752ab9d3d8996644e7ac5c2189b33fb055f90. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/VNA0F2316263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1be5238c331b6ba34aa9c985a2a273586100f34cb9abe0320807b4c0e7e61a59. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/VNA0F2316265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x011ad097a41103d35eba87b057f1030b53cebf239e67e8464202593376632ea7. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/VNA0F2316266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x734032c982d79d3d46a01dbcf0c1af9cfa527ad1eeeb704c181c508181a6d577. 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/VNA0F2316267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01b22cb4bb2e7f5401a696b8ed123f42936d81c72e02068ba8a33504906cd2c4. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/VNA0F2316268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eff31e2774a2edc67c4518371e67744484e769a5eb32582de8ee16abb99e3ab. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/VNA0F2316269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a5cb33de8859a4579d10eb0f5ed145c23d3aa087ecfc2d34f769fad699c32c. 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/VNA0F2316270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd941aca756466dc8672ca78903ac5e4ae57d3650d8e7909f98d5b1d267fa33d3. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/VNA0F2316273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x358e847971bb3ae15ac216efad78340559cc12fb5515bfacb8335fbe1c15898c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/VNA0F2316278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0ce72767daa1220b35fb3879bf56ed6624fe7e0c7a7a9c7c25f03b1742e7210. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/VNA0M1842237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x447601b5fce531ec8798b1dcd632a789951779d2899f0678d0e5926e83211cc7. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/VNA0M1842261.