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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e2dbd56878d83a6f502b659b7657366680c009ce6aae495f62ba1a0c75ceb9c. 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/03e32dc3-d005-4303-ac45-ed005c85710f.json and https://artists.proofprofile.net/proofs/artist/03e32dc3-d005-4303-ac45-ed005c85710f.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf684ba2cf0c3a77e274b9031f7cd8ea2bea02dd7540aa2f640fd21e272f2d926. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/NLDG30800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x849d16ebc50398d81abb94ee599581f8b07cf8e3fadfd54222c0722c1e83cb45. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T22:00:17Z), 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/QZZ7X2425903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e3e715f2415903d20115880623c2881fa5c540bc786ea06592dada4569f78c9. 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/QZDA62570585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a118a88b9553b5f490bb18eb1ff062f8ee6650b4127319980b41dd49e264f29. Chain 2 (Bitcoin): anchored in block 958798 (2026-07-20T02:19:11Z), 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/QZHN32576733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc1ee5dd99f4dda47e0bf8f4939dbb8dbea5b5ed8579ee4c6e3960bd7c9c1216. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T05:04:49Z), 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/QZHNB2566760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x444724961b6c91665c57ac402d71aaf757247c4421b78b602638d5c79396a357. 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/QZMEQ2565798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7807b83038eb0e635074bee44de3de747261f84cb030f4f616c115ead7400b4. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/QZTB52563954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b78ac18f3bbfefafc6a848dc31a2a5b8cf0e9068f18ba914ee387b48e9fc711. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLY480900013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33ac8977dd4b0e394f7357a9d6cb486705841e23ded0a3d9e0fad25d5ae45e01. 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/NLDG20800024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc54481b8e82832163bf3225921f764b795a1f1bbdc9499ede7114133342567cf. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLS242000347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd91d67406b83f67bf83eab45572c0cbd2a4c4c25ddc9ecc59456ac6e43fddf4f. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLUM70600644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8851bf0c5ceb4c41b8cafa532d908fb463cf263cade165f3b7069e38f33e93ca. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZK6N2325566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57b3052bd4e95a5bbd9f6db25b7be889316866d9858d4bf77c1908b4ed218085. 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/QZFZ42288297.
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 0x473e1bf206a57829950053a79f72fc2afd8cc8d44412054f3c7185e9260a7204. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZK6N2325564.