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 0xe145322d3af9c64364d5120dbb2234ee5e936b2730689a46a34c807275a1090f. 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/5d631580-e351-4d83-8f8d-0856ec68aec8.json and https://artists.proofprofile.net/proofs/artist/5d631580-e351-4d83-8f8d-0856ec68aec8.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 0xe500d282848cc7f590e363669cdacbda47d283fa2f883112c2899c8fd7e3f403. 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/QZHN92426234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14a07031be85695e7398bd30021d29bf47a62f46cab711d415af1726b9310705. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZHN92426235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25a7dae00d1ce905ee979043d239d566c8b7b7de0688b3556504913a2268a72a. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/QZHN92426236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76de82f1971deaeb914be0fdc448013c30d29fe5123d8b793448df0dc322b433. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZHN92426237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x928098b90e7097196c3ff4cd05eb2ef7ce44ee18b174bf99a2e389df9b90826f. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZMEM2244699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa077c462d77204f457eb3aaed1919d2e669eaf1f97f489873b4678b122b827e. 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/QZMEM2244700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c81ae3ebf71bebaa2e91f1fd418dd93ddc26ce5adb0d43a30ff05afbbe30468. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZMEM2244701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b5f691858dad0b71cbc9aa3dbf254c1ad7926bfa66ba32dbe386bf3fa5575ba. 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/QZMEM2244702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0d357d0d76d28a5cd9069d7648cd07494ca0f88fd8b5776073350b628c0b9b7. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZMER2370411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f7a4b84552d3d9d8a709252ce89a56b6713c6ea11a61e77c09fe0f10d5c8af2. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZES92393182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11b9b0015ae97094dfc108519e018d546511b41c89a12b3dbf5b760efee2879d. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/QZNWZ2228055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa660cc437f7955e19b823a56dc990294d8cbe62f96896e3b74ff60e67f3fb4b7. 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/UKXN22212828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x211b5a7a669e424fe9ca21b6b14fe43a38bc22824e6376b5563f2ff01821eb04. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/CH6542247691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68a519f10f2a47e97a526bc1232cb36d32e122eb5e3c77b0d6b1f6b027c38bff. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/CH6542247690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cebe521ea97fe11ca4bc8d061f40efcce145439439e84b9197537aea7ed6125. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/QZNWX2102517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8078656b67480d0ce26b69728ed8814bf04cb02534155c4507ed75a0ab81cd33. 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/QZNWV2122327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3dca6f24412ad8dfbcbf167476fd93624c59b5350dc44679f6523317c62a01a. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZNWS2139725.