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 0x6ab2bd0373beced5bfbe2bd3451a4bc6b78eba2039a7e642af0e06119d4424cd. 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/0a91208d-7f30-4700-abb2-af639bf06c10.json and https://artists.proofprofile.net/proofs/artist/0a91208d-7f30-4700-abb2-af639bf06c10.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 0xed68965557984335b61324c7403ab62d6f15765cba16eda3475b394fac5b2fce. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZFYX1902160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7e451252942599c1d1e9f19f79e6d6c8b83e9d9529af4b5167c3f148e96ecdb. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:42:40Z), 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/AUBEC1911519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6207b343d7b7c7157473ec6776385a186627eff2f56a131f713e7da44cdab108. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/AUBEC1910968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11dcca640382b67777db91f42d2ee2dd5b1c7264639a9c62343cc2369ac3ce80. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T23:10:05Z), 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/AUBEC1910974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf32fd372380c715e48b56d4dadf5016c2ba4a0261390459d1cddae71f57722fb. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/AUBEC1910977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f15fefd6d7af9068d89e0f00b508029ff4277504ed739bb9c0707ae39cc9c4. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/AUBEC2079582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacdb569daa072a59f3acd8b03562b9a3ec1d0864e554cccdbc97d106a3db8c09. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/AUBEC2214088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde05e6cce9a3a1c16b5a2b5aebbb751eb0aaa365de4f666aeb17a007078bbbb5. 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/AUBEC2236499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8c3b35425004b8f4d22ae6aba89f079c909043ed59d8575f0fdfb84e652ef7e. Chain 2 (Bitcoin): anchored in block 958378 (2026-07-17T06:45:39Z), 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/AUBEC2315666.
Quyền Được Sống Trong Hoà Bình & Bài Ca Hồ Chí Minh (Special Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc460bc124463af8f078c75ef685ef18a93a74e443ea7be2ab8374eb9322c3452. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/VNA092500201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d285837856cce0b895a98c1305e8761176dabe7140dfbeaea423dc53e069f6f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/VNA092500202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabafba38cef6f6fc8b78a66b2ffa23ec01031c141d8ac45c25bf0603e8202c2d. 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/VNA092500208.
Như Có Bác Trong Ngày Vui Đại Thắng (Acoustic Version)
Tuổi Trẻ Thế Hệ Bác Hồ (Special Version)
Tuổi Trẻ Thế Hệ Bác Hồ - Special Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfca737576058c444e2b096bfa4829b4e4d9da1e2246a50d818750563a17ed772. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZPLS2593771.
Bài Ca Hồ Chí Minh - The Ballad of Ho Chi Minh (Special Version)