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 0x25be74dafd98bf800584155d7fd240e6c8dd980e31d08a4fbb484163660298d0. 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/bad23411-f1b9-496a-811e-2e5378faf7bf.json and https://artists.proofprofile.net/proofs/artist/bad23411-f1b9-496a-811e-2e5378faf7bf.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 0x3a1d8b92e4d1ac351640d93819c816708ec7efd249ef18f4e512a7550fc500b1. 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/SE5BU1886061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf80d7517bd14f8d7e1d757462962f777525047dbaeecbc323b366bf84996abca. 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/SE6A91878828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c7d0b553c3f2fa2596ccd8eef05c6747352ddec113670d3642ef98a964b0ddb. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/SE5BU1925177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaecd6bd51b856e433498b3f8040cb708ca645de45a3ccadb02fb5d9bc1d16480. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/SE5BU1985702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x293a12b3084fde05efbf9a9ff31337b794fa4e60b4c29a6c4e2c6dfedaa79593. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/SE6A91949270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c0cbb1ef032b777c19ef548f3b3c14626d1ee237000674771adb86d8fa21f3e. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/SE6HN1940220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x736ab8cd7a532f2c94f356beb5c18ace2e1deaad7c58405de67bc83a762ac963. 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/SE6A91960535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b082206e61a581ec380e59faffb58cefc43e045c66a0dec767115e684b86e58. 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/SE6XX2160479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x905ae9758fb9c5ab34829799f7cd731d988b8163582cbddc5103d9351aa53d70. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/SE62M2130397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c26ecf025f6fc9f488c9950e0fc5496f2e7bbb86d02de6efd467d8af376de8d. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/SE6XX2249516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a6709a7c028074020cc27fa7489dae7f9b00721ff6f58dad0d9df8b5f3d05cb. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/SE5BU2263464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17a623f0fcc3de0a9db1e3480d665ae9700c36f6edaa497acb0782100b364f14. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/SE6SA2344550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f3f06cb51404c47c08c552f878f01b97ae76ea285be5a02ebd3338cbf3f7106. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/SE6I32490832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ef76a597184b1f08b93e1c2077450f0865871f1273e8ccfaccfccd7b68bd9f5. 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/SE5752404630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee40c76f3ba4c727eedc0ffc59e5726a1cba70f74bc22f8211435d02eb0e5fff. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/SE5752492055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b8086319a470365a0f05139ab60aad6febd7cc8e5937d54bbefac4c8a9e7934. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/SE6I32420178.