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 0x70d5ff1f8dae6d2e6d2efd8e0b6b678f9aaf64cff76223159cd79797c0ee1691. Chain 2 (Bitcoin): anchored in block 953717 (2026-06-15T01:05:33Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/88fd6118-23dc-4002-b9de-56b1300d8978.json and https://artists.proofprofile.net/proofs/artist/88fd6118-23dc-4002-b9de-56b1300d8978.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 0x550d4e5af57caff8f25829dec9a4930b43787a8100edc7f845e08a80b71f4650. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZFYW2026741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d9a874c5076183019b574d1dd64e9307a73fec088a206face0e206466c26327. 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/QZFYW2045759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bc6de4f7872aca8e5abee53506033d89b9839349b7f7d0d0c4e65e0684691a9. 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/QZFYW2044430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf433b9223da988db6d345fb314d9752749dc449c405139c891d0c5eb7f9a2d85. 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/QZFZ22080877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf462dc7b0107a65732c818766650915b36de9dd0f1159b8bcd3b98d2a1927f62. 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/QZFZ62059046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x405674790b42537b217ebb71407935257eae024a45beeb8b8da18264863b6b72. 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/QZHNA2152405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6001d7956f416ab2ae9e81701afc05166929148cb78aa5e0dad3339a35123ddf. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/QZHNB2143618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x701ee976ee0361f1ae901509c9deb7bf026525ae4d6f2f216468e372396bcd44. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZNWT2140018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec47b862103fc762b7c2a0804cb9f3ad9f6c374aa4a1ff6273ebc45f198e03ee. Chain 2 (Bitcoin): anchored in block 958798 (2026-07-20T00:05:41Z), 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/QZFZ32223016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fa3948036ae0080ca76727a7b10c9e7c1e07da3a98e056187580f32baa9076e. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/QZK6J2206232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x867c3876762c19f2bea1e1206bae1b1a1a2f2a1e4b28f1c76aa449ed83212da6. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZK6P2346445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4437018a6328714ba6aa8bd204a842a079d12dfa9df2e1025b1836e11c344cd5. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZK6P2346446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74fbd45aa87f8346245de95e764210b4562567d1084b811511b8c4ee6d0f3893. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZK6P2346447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f9cde0413de2871aa1d2e02949cd02f7f9577e50927c554f4124179ae3e9ade. Chain 2 (Bitcoin): anchored in block 957772 (2026-07-12T23:31:17Z), 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/QZRP42534830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd7c341546f3a532037f474bd0c2a1797669b57d622f97b54d1feafe5e367ccb. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZRP42534831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24070084a4367c0a33beb9e58722ab8cb85417c6b53962b7965c1618b0ef6792. Chain 2 (Bitcoin): anchored in block 957772 (2026-07-12T23:31:17Z), 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/QZRP42534832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcebcc6224a5086dbbe20771b5cdf6899524f7083583405c2bcd3b9c735b9a179. Chain 2 (Bitcoin): anchored in block 957772 (2026-07-12T23:31:17Z), 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/QZRP42534833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacc728b46a0a4ff25adbdf9cbc18bd0cf190f1a58e237458a810d95c30ad7fe5. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/QZRP42534834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f5f7f98ca3333fdc06491a228c1269d6dd41833700a78babd1fac0ec2d9506e. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/QZRP42534835.