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 0x6d4ffbf064b65a08689a80571d075ed541be32c4f75af2768ca230a880ca2e77. 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/5f10ca63-c9bc-4d2f-9d4f-7befec3a0226.json and https://artists.proofprofile.net/proofs/artist/5f10ca63-c9bc-4d2f-9d4f-7befec3a0226.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 0x2e84ffca13df1a689d90f1ded670f65573f9e2fb7b99ace52a2e1f12abebc02a. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/ATW630401603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b214b4329119f60e7f91304e60947d915d667e02104916d2a85e4b476ad37dd. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/ATW630401506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x558eac4c13afa9896e4d586a879a9778df5ee86a9113be53e841a90326e2f88c. 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/ATW630401509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3095bfee92be5cb1bbf3cef5e658daa7ecc2af1bbb4c676d78f6d6e098b5bbc8. 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/ATW630401510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb41189c7d644e6c9b74569657c5eefc9b98830cb0e9f706cd664ebc26bfb4f8. 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/ATW630601703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x040bee9486280beef8791f2c884a8f9610177035bbda91c62b9dffafff64091d. 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/ATW630601907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3b88fcb63cc54f3f0f633e22896c25e8e8efab19ce181a5c8ce652b5ab039fb. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/ATW630601909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a40056a879518fab6639aad9ec26200b6d4750c6d3bcc1a424db92984f83f1e. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/ATW630601910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3af9fb2ad242caaabb31e9b302838db2d40229542efa8b38ba137afcacac254. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/ATW630601911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf4cfc9554e71745f06e94db2872908e0222265fcc1a8b4bff5b3b85ddb8313. 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/ATW632307601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae1afb2f17c0facc11fe6d9c4371f40696a7e818993dbc82e7ac121282cec89c. Chain 2 (Bitcoin): anchored in block 957620 (2026-07-11T22:32:56Z), 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/ATW632307604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8377f28f272b7297d2efaae0206908959e868d9a782c82b7d240d49053e8cfb4. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ATW632307605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2bfda369333d4cc57f3b9805c159a2336527ff078e6ffbf27effdb9eaecc37f. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/ATW632307609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1818dc776a7964548b2f369d8057a4c4c8e97a7d592ff7a1c15dde83e9b3c150. 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/ATW632307611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb980173010cb21592a90b7cbdfd25aab0f6ac3ad3f41083e6ae7579c14834080. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ATW632307612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ae4ba1bc7213c8b011c3f731dff5d2c6ed05871f35430f191af26511904410. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/FR6F31356630.