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 0x29a01081f0cd23efdf5e1831417f1b6d1c9c75b8196cb57f62c6e7c23f167cf8. 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/bf27f255-f97e-402c-b1d3-8d235e28eb52.json and https://artists.proofprofile.net/proofs/artist/bf27f255-f97e-402c-b1d3-8d235e28eb52.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 0xd13968a4953f2a0ce9f14359815a50c129f0941cc987db6848c2f5c0614cf386. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/USHM21157157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8a61ea697808c514f5ca84a691035b6b884bfcca874dc138786fbc4d4fc74a8. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/USHM21157159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48369e4dad09b34497cef9e6d8cf9bd36ce76b525bc25f459b70236d020c8816. 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/USHM21157163.
Tiếng Hát Trương Chi (Tuyệt Phẩm Văn Cao)
Kiếp Nào Có Yêu Nhau (Đức Tuấn Và Tình Khúc Phạm Duy)
Bây Giờ... Biển Mùa Đông (Đức Tuấn hát nhạc Dương Thụ)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x245c70dde22df2a3845ac8775b5248bf29a2a444584954076befa8cd3164d17b. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/DGA0M2441471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48f7728c1e7bdf1d6a5e10a3bc8b297fec9f70452ef7eafc6ab0722db1cd1613. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T08:39:19Z), 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/DGA0M2441476.
Tình Khúc Phạm Duy - Kiếp Nào Có Yêu Nhau
Những Tình Khúc Phạm Duy - Trịnh Công Sơn
Những tình khúc Phạm Duy - Trịnh Công Sơn
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdca4815e98edf71a6fe8fd7c0550254c28c1852f6696a4a2999394be8008832. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T22:36:18Z), 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/TCAEA1808822.
Dã Tràng Ca (Kỷ Niệm 80 Năm Ngày Sinh Nhạc Sĩ Trịnh Công Sơn)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x570388d1bcdcfd269538d7f66dcec88d650922b423f55a361feb738d8f7f9a54. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/TCAED1942154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c2f6f7656be2a2dd046e3d11f0a6535f5c96c701c64d68560020d7b87dd2c79. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/FR2X42416060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a7be7b2ddf34800975cd85e26346c96695e1346aee573283f5f62da1f09f3fd. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/FR2X42416061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x147c3dbe0b6613f3e1232b19445f0346da7a778c5cf0ddb7dd31c30a712c26f8. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/VNA0M1934276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x265084ceb58c490359cfb4ddedcd6d38066dfa8f10a75e8c4561e01eb812ce7e. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T18:43:34Z), 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/FRX202539884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ce694be384cf3bdb3e913ae0355b9051d68d1adfbcb9b5cbf7b4487c4b2e846. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/FRX202539885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ce921fc5b8dd2600efa662bc206736894a3df5a9f9f27563de82b5ebf28e98. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FRX202539887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98b074a22a99153e8dd481b74c203239aaaefdb98adf7cfd9b7baf337c6562bb. 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/FRX202539889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60f823524e5c914ad12ab08981e9a7f12791f0e5a281a567fc367f5d14b52b93. Chain 2 (Bitcoin): anchored in block 956862 (2026-07-06T02:10:22Z), 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/FRX202539891.