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 0xd57f028ac1a6872a8d084547843958ff59fd5d1612612c0601d8ed42dfee5abd. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c2bb1537-e13b-4f83-9fbc-ea3c60302f91.json and https://artists.proofprofile.net/proofs/artist/c2bb1537-e13b-4f83-9fbc-ea3c60302f91.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 0xc0a9bc6f7a9f53d12706d488389f7b3585ad8f685a2ec16636bae971984b2ae7. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QMDA72415750.
EM! (From "Bằng Chứng Vô Hình" Original Motion Picture Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd2ae9ac5855ddb80d0c4a096c25b08db4fc77639c7f33db9afd930cd8a238a4. 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/QMDA62453887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58e83a1dc936fa97303d5b0f2939538c7ba975c3578eec506f0cd2a505d9892. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:49:36Z), 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/QM4TX2589577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40c00a74467fcb52f240f366c63333570733ee9bc37297a755e691de47524c37. 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/QM4TX2589578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2bdb3639d3c2f853dfd914fe0700dccf80755723f4c84447baca72875641c9e. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QM4TX2589586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cd891d24c467edac9100d802d0a6d323b96fc4eb7f13f5cd907fe31f77d5783. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T20:56:25Z), 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/QM4TX2589587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca1d7d995c1a03115a8d7a52a9f19ffdfbf2dd7c4695efe42c3a2b7e738a32a5. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-20T13:55:18Z), 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/QM4TX2589588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x728588c1183ebcaea03ed1ec156843f7eb49b0ce4cc08d8deb025271718f80a3. 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/QMFMF2438995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe70b8c2b41c777b6466feceee7617a50ff0fb6c788b882a56a25392f8153e8b5. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T14:58:48Z), 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/QM4TX2589589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc28e44eb55b2e58c34ac997ecc13db780a3a5546c1418e814ba26bd3a27a3735. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:04:03Z), 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/QM4TX2589591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b1ef323bb7a3ef658207239b3996d4fb6b3fdf70ba16c3d198442dbc7cdca67. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QM4TX2589593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd2ae9ac5855ddb80d0c4a096c25b08db4fc77639c7f33db9afd930cd8a238a4. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QMDA62453887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d51ec4b11324a651c675198162a937ffa322e6265e2110534c8c49f96771e5c. 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/FRX282112702.