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 0x5519293c54411afb0d9a6f904c98aace133b9cf8d2bf39a94b914c0b28aa1ea2. 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/3b450094-7aa1-48cf-a13b-a85f95a1a82c.json and https://artists.proofprofile.net/proofs/artist/3b450094-7aa1-48cf-a13b-a85f95a1a82c.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 0xa44b7c61f365c6d4e4e3687c1a7913e94e7560abff7dabe66575b34263fecdd6. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/UKZGC2202956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c2c40645d701996a7037f727ae706b95bcc13de8043466f1e464dc9c80aa1ae. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/DEH742229766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c6d2af32093b20e1855bdbb5d18c48891ff49d3e9b5de59b79c6d0e301a87bf. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/USANG2280879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77fd2a61007d9001d195a66907e4a588ba3e7bca6013afcff31314857da4b058. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/USANG2280876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75a471e4bd35eab22ba43cd4897de578e0d5e9a33c3ad9d257e4c1b58dce0b1f. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/FR9Z62300360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf60dfd9fab75b24e2e824ae52dd85909e758557642cfa18a8ac02a70f7ff41a. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/DEH742418809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b6efb31ca1f5261663d4d25eaca529a482f4d3fb15c43ba993a5d8bf8ceaf8d. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/DEH742426097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabf1c18b89ce5b053e5d809a87a32a8812aec1b29cddfd8169880c6132949c1e. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/DEH742428241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a202ae03b8d6b6995784529b505aaacc4fb30eb93c9ce3206da72dd0dcd7e1. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USANG2450284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x767d336a9af15d8ce5f754b645ef20c1c2676cf4b2733bfe90c0f1bb799968d2. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QM3DF2422088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc0097f1cbc5538e72bf2842f22fa41e8c0a22340fec546f31bde80aed70d6ab. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/US3DF2526670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64c3f65607a32dca8e7d73774e8e6e2f81736896330a01130bcbbe16eb7ed711. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/US3DF2548621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d4482f4bcd8f1bc42181a89c9eb2131328db0545c4d1bc53d20052ec3abbae7. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CH6542552446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5260eb4eaa78c57de454f041e90a92e91fbb792f772fa22956463f6e3ec69e6c. 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/USANG2513749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7569b0d757b5f7f5adee792392a22fccbf23d11eeead2010a5aa2f5ba81a2b5. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/USANG2520667.