C4, C04, C.IV, C-4, or C-04 often refers to the explosive. It may refer to: Places Caldwell 4 or NGC 7023 or Iris Nebula, a reflection nebula in the constellation Cepheus Circumferential Road 4 or
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 0xa7fdfb813aa70c17f58bf93a0796ae2e1de785785a7dd0970432f47f2bef12e1. 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/82435252-9089-44e7-af75-a0b7de66a637.json and https://artists.proofprofile.net/proofs/artist/82435252-9089-44e7-af75-a0b7de66a637.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 0x429af16f0cabb073b1c489cfe4289f3875a5e209f44e515761ea86dd7af42817. 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/BKEZ92400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x518baf6e70717e34590873e9714b3c58b630167fd8901620f296b6979daa480c. 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/QZWDE2412749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba2622ebcf18560b94a9929ab924d321bec40e39bf8fa9a3e204e68375d2667. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZWDE2407507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2737ddcbac00ffadc71dd4c0acaf922a4c9f2afdf645bc7e48e139a2c2ef24d2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BXLMW2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4994dcba112571c1e32292253cb64ea365d4f1d8c6f76ef8794437a5a4c68efc. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/BCVGM2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b3ac5eba4100bdcc53ae5b381102fdab50d98b26e4f96cc4c550ef03bcb8989. 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/BKLOL2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f0a80f27dba9a074487b9e9c30a8eca4cf1f0414447740f1883550e6891dd4. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/BKLOL2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x975ccadadcc2d48c94c5395da77e18d1b997f0b0397f0b7c6014119fad4ddbc3. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/BKLOL2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b35d5d144afd958317f3907d92263d643d8ce90f42b4b837a5f4f8525134c62. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/BKLOL2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff1a979f464cd15d27af8b7e56bac7265e07068a8ef05e44d9709044b863bf1a. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/BKLOL2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe887ef10aee540e171897e4a6f0c81b9d382ae7673e296daab5f8ea257dc5eb8. 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/BKLOL2300200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x429af16f0cabb073b1c489cfe4289f3875a5e209f44e515761ea86dd7af42817. 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/BKEZ92400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c1362255a571232a692ec08e28cd359da47f44e50d127840efb278f0c669a12. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZGLS2411219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ce55d8cdd6a4b57aa867608c75fb8b00644e6109c3f24e48cb533b5bc61ebd1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZGLS2406108.