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 0x996f9d0064df39fe19aa2110b61e02863c984cdac84570e30d5fc74ee097e095. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/66b4252f-39b4-4589-ae77-640b3a369046.json and https://artists.proofprofile.net/proofs/artist/66b4252f-39b4-4589-ae77-640b3a369046.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 0x7f81690cfd48c005da97b706b395d6fe8bc5bbd31494e5d61c3aa6d7dabd9048. 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/QZN882406318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ed5e636c95c6101bd36221d72e5acc3bd0cd33c3bcc0a66f0c442c1fe0cc645. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/SE6HN2449698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacbe89419fa5aaad4107e32c8fe68423329655a15b3f3b1cf00de34ca8464b78. 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/QZWFN2387975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe4dd4d4b5095c293785cd6f7a66d0cad5270e2efffb680696c0105f66d91b66. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZNWY2380217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea51ad74f94eaa0852f7754d9cd11a064bcfe1c2791667363014426a55876f9. 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/QZNWY2380218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x469a803b592583d497ea8eac54d227f9177ba9e15c005c4ccc6324000ca94c63. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZK6F2355082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7422f92af88ba4f67d5c4f7d5c07632f1928126744198310808a5413ab152747. 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/QZNWY2380220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb960f4d7cd17f06d61df17cbd213aa081bc3c48325c1fcab29f3a57890a95e05. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZNWY2380221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x469a803b592583d497ea8eac54d227f9177ba9e15c005c4ccc6324000ca94c63. 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/QZK6F2355082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d00c02cc575654e3df8f25ac796dc970d74572032a3b2394c50d73b863a20ee. 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/SE6QE2492464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36878854013a9da16cb6e2dffce638971865087cb90eb5752667d6ddc925c8f9. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/SE6QE2492465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ed5e636c95c6101bd36221d72e5acc3bd0cd33c3bcc0a66f0c442c1fe0cc645. 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/SE6HN2449698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc228501842f252f74a718b82321e350ffd9f16c9abe23518908e64b2cc4c2e10. 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/SE6QE2444297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d6968e5093241da7766638f44d2b059998555d3e9f8e863fa312b02d90341d0. 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/SE6QE2492466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bd8fbfb3bf60441585f4ff51b528ceafca1c359e782835f03f262be3851ef32. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/SE6QE2492467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eb0c42b2c2c3c1debb880afe48adf993700463d35ca57c0533a8a72e1bbc8ec. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/QZNWX2424017.