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 0x82efc23d795746d2256be4ad5e3f01e74f1345fa5d88b2ce0ce20b9888d6ca45. 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/e7b0f993-ca4e-415a-aede-a476b8c55ca1.json and https://artists.proofprofile.net/proofs/artist/e7b0f993-ca4e-415a-aede-a476b8c55ca1.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 0x35cf4cb2c04c8bee5e9ab083312ce1a4e40eb2c9bff51ee7b26e61c0da39274c. 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/VNA0F1781538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21462abba816be11f55f6989d290a38c2c8a337403d598be5e2298ae8a20c68c. 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/VNA0F1781549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe622b6feb4317b18e366eb07e7e0704b4a9e67d41ba31c4d61a0fd692b9c7aca. 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/QM48F2000901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x243dc98a801be3f9b2b324ec2939d8b2151e2e56bd0aee4c93213b7c0ff87145. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QM48F2000902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fe5b8750d17d518628174bc97d6315ccabb9378a47beea462552217d9a12a9b. 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/QM48F2000904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08e23f52f6d0d3be94d5ff128689d1d7ebec6099cf7fb77580fb0dd0200f76c6. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/VNA0M1813820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b5c0b2e52e8512a962167a217a256d3195d2064d18b3b3d08169af9185c87b3. 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/VNA0F1735710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9649f0c00faf7021537874708549b0608c0b27fc05c6fd99c53f73463b65c8a4. 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/QM4TW2091566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ebc3c48daa1bd2ebd2b9f22c42860c071b7551b5d5b8481cb5cd4c3869ff475. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM4TW2091567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c954eadfa1961c31b111e407a6a411c6f40d4165690e94693e34cb1adf18997. 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/QM4TW2091568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e270567ffe1464a266f78f066980c26399ecd99c7b14deb291581e803decdc8. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QM4TW2091570.
Giữ đời cho nhau (Thơ Du Tử Lê Phổ Nhạc)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa176361ee4d5d1354ff7a4a46ed66445924f30d3619a0d58bec581e642d21b09. 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/USJ3V1116507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1781f3e231174c1bd8739a7f39f463228e29b9519dec34bb560bccb7d9625680. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QM4TW2085375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x397812ea307fe9171ffa0597d66769ac50425f9d4601b02de8226f7ad68d1b28. 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/QM4TW2085376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d18666a3d81fe663162f73bf6a03fba8e7b27f2fa1aeeddcbe7305438fdc628. 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/VNA0F1736405.
Ý Lan - Thanh Hà - Hoàng Nam - Thương nhau ngày mưa
Quê hương là người đó (30 Năm Thơ Nhạc Du Tử Lê)
Hà Nội ngày tháng cũ (Tình ca song Ngọc)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x749ad81a95d5e373314fdfcee89d49bf0cf5dc4eea6e2917098532fb51710fd9. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/VNA0F1735214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f1d5bee83ca36d7c5df74ccb13008e7f1bee4564f283a48ed37d5fb91dc28b. 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/VNA0F1735215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcbb938e66a136010dfdef8c177237421ea2a5d31ad7c59a5491f4f8c3cc2b1d. 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/VNA0F1735217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68b3893a24728f82210ac6cffc0d57295fe291bf0686f38c648669032c5cb4b7. 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/VNA0F1735223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd75a8adf5362e81e8335a84082d44178feabfe92611f82337cc7491050a5d6ff. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USJ3V1107135.
Lan - Diễm Xưa Đặc Biệt - Ý Lan - Ngọc Lan - Thanh Lan
Theo Anh Bước Xuống Cơn Đau - Ý Lan Tuyệt Phẩm
Ý Lan - Xin một ngày mai có nhau (Tình khúc Đức Huy)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x361f972c597cda5f76de58fd4295b9a6fd57f98aeb361ca7f77ef2902fe3045a. 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/QM48F1758404.