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 0x49f3380e9cb1dfebcee48a9e66f60a2f6517b64a38c62553bed19742b3aaf35f. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c3adbe7a-b69d-4248-b7df-f1e50349c88c.json and https://artists.proofprofile.net/proofs/artist/c3adbe7a-b69d-4248-b7df-f1e50349c88c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Dấu Đạn Thù Trên Tường Vôi Trắng (Dĩa Hát M 3559-60)
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 0xf2345c2cd93270e6c9f5d3640c0557e2300ebf20abb4f7e60335ed14912eea87. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T12:11:10Z), 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/QM9SX1513678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x211702eefcbc028006f40811942716b39318c7e365b752f9cce620fa6a8e2949. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T22:04:09Z), 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/QM9SX1513679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x812a7b4eef49df2098d243a90130a7d39b8a90af4aee826161864fc4e30b5027. 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/QM9SX1513684.
Nhất Trường - Phương Hồng Quế - Ạnh Khoa - Tà áo tím
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f4a449799431b97b8acd8ceb3ff0129cd84e43888be0948997a68f536764c1e. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T13:55:07Z), 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/VNA0F1741090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c83cd6c32832652192df0904810668f464d8c2658ae53c7a78670b769520e08. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T23:41:21Z), 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/VNA0F1741091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x235f09d4d7a709c22528a104bb0f8c27e62f5d1d7d05ace296946f10249dded9. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/VNA0F1741097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a2184d1363b50e22171f20004c812ac71aee84f45a93d2be147921b97ef0190. 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/USJ3V1198097.
Liên Khúc: Tình Anh Lính Chiến, Không Bao Giờ Ngăn Cách, Chiều Mưa Biên Giớ
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2528fd2a172794fde08cfecc2577ea7962b8bd89e25b8663f7f4759173f214b4. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/QM9SX2301897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ad4a5cd85539d67701e3ca0c6d4673807cc7f4312becbcae618b7899c70c43. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZGCD1806406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x359a2002b45a52f5de0c5186e4ee430ca8b1a2af13672f32fbc851e181e1807b. 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/VNA0F2104312.
Nhật Trường - Trần Thiện Thanh 2 (ASIA 61)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aa4991dd25649884eeadd443a770ac74a30bd875ce4f9aec1a2eb6b6a8bcb15. 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/QZGCD1806316.
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 0xe5a76cb6a9db2358d4a3a4a6bbd19d2f398b590c079d1360306cee2713c983c8. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZGCD1807601.