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 0x07270e4329b5cafc822c0561acd9b0775930ff5231aba6f3ca82275d8472f169. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d5d2f314-30f7-44ca-8194-c2ae494a9eb0.json and https://artists.proofprofile.net/proofs/artist/d5d2f314-30f7-44ca-8194-c2ae494a9eb0.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 0x3c78ca9f3ec38cb61a2a181a51f5a4523b30f6c979f3761c25f384ea40ac41b4. 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/QZGCD1802252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8637fe07c99cd4c435bc6df3fc8cf0a050e8816c2268a9706bebf7e33e562a1. 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/QZGCD1802255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e7a0d70311d957712b4f5d8daa179e0cc524033c990a3e5957c94b3cb7048d9. 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/QZGCD1802256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c58ecb8fa57747b12175b5e9159eafa309ef6d960c733a93b7489c778abd4d7. 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/QZGCD1802253.
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 0xee3a0543bdc2217397f2207c56e3efedac47ab1dbd636409fbbc68b6bed458b1. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZGCD1802258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe314225b1c84a52976416533480a2032466c9a445aee907e903d20b9303abb3. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QZGCD1802261.
Liên Khúc Yêu Anh Bằng Cả Trái Tim - Nếu Có Yêu Tôi - Bây Giờ Tháng Mấy
Mashup Em Ơi Hà Nội Phố - Lãng Đãng Chiều Đông Hà Nội - Hà Nội Ngày Trở Về
Mash Up Xin Còn Gọi Tên Nhau, Nỗi Đau Muộn Màng
Mashup Mơ Về Nơi Xa Lắm - Im Lặng Đêm Hà Nội - Lãng Đãng Chiều Đông Hà Nội
Mashup Một Dại Khờ Một Tôi, Nỗi Nhớ Mùa Đông, Mơ Về Nơi Xa Lắm
Mash Up Yêu Anh Bằng Cả Trái Tim và Nếu Có Yêu Tôi
Mash up Nếu Có Yêu Tôi, Bây Giờ Tháng Mấy
Mashup Mỗi Ngày Tôi Chọn Một Niềm Vui - Về Đây Nghe Em
Liên khúc Hãy Yêu Nhau Đi, Tình Sầu, Tuổi Đá Buồn, Phôi Pha
Mashup Và Tôi Cũng Yêu Em, Và Con Tim Đã Vui Trở Lại
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d5592db89760985af87e6dc2330b9c031f31376221e0f47877b1e960fa3d50. 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/QZGCD1802031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17742000802e05fc0861caf7a742d4a7cce8051751f988ca30f7fbf74a07f806. 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/QZGCD1802248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe07acd15c783d2f694dcece7f637c3d121e3077d91827ab7045c7fcca3e9ba03. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/QZGCD1802029.