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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38e8b5b01663502b54ef46c08fab644606fd5a16783956044f356e32bbce5b63. 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/d45862ee-1ecc-40ce-bd9a-37c36f4dbf06.json and https://artists.proofprofile.net/proofs/artist/d45862ee-1ecc-40ce-bd9a-37c36f4dbf06.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 0x10339e49edf5719052cd2a27bf281ad38c574deb1cb5e155c26ed3aee39973bf. 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/GB7QY1200088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ccfec7a960cad64ed17bec0a33fac7026bc80df3516c66b897ef5056fa9c4b7. 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/GB7QY1200089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23340af1fd1ff7453277c6796dbbf4d96f8012ed2099ad28099af07e04e5aa1d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBCFZ1500089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb36bd04a047fc36759be1266d74366ac51f905dc2d6f52dcad3e57e98f17de7. Chain 2 (Bitcoin): anchored in block 958828 (2026-07-20T07:55:30Z), 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/GBCFZ1500091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc89577301185e88ec1a11b8dab7bbd1704216821bc1947f61ec0071021e4d09. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T10:06:33Z), 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/GBLFP1890718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x603417e97a84832834eb531ee976f3f4ab609cc041c365a57847886067adcf7f. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZPLR2409868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb5258e9c9007e2b4d74b4f71c1733515da7739b2bef37a83143f9a1ce415bd6. 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/QZPLR2409870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52d0a3f079f10e1375c78365f15e115b585dc57ef5178f8caf7605f0e5406113. 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/QZPLR2409872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8af4950f8159dc3a96816baca15bada39b0b69295d2df9d53bd336f7f9abb67d. 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/QZPLR2409873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8c8a1fe0c9fb164c9b33d7692b3713917ddcfdfca47a70d064c7e5270a881c8. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:05:12Z), 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/QZPLR2409877.
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 0x977b8bfe6a9207ae6dc0600c52b46cfef28af8d7c1b5afd8638a49cc91a3c2cb. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QZPLR2409869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x692ece3d5a7ac1945450a3daf29da9b31adadcb205cf13f680a4f1ce2e7789eb. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZES92478449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7ea527e1a64e352c17231e5750c5bc5d1f3394f7aaa3d269b73450fe388514f. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/QZPLR2409871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fa3962517a374b0a6aa3ddfbb3b5b994601411313ca7175f1244526c898d7f1. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZPLR2409875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20fd0591596ab8b230dbf34590f2421f397ae400fa4a270e274f9b25f1c4b063. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/QZPLR2409879.
I Don't Wanna Hear That - DJ Q Remix feat. AK, C4 & DRS
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x027f4cdef101a8bc60831f51ea34ad10a86956127248edcacfed0e9b426014ef. 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/GBCFB1404404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd86be06721910c93a847201c5aee5987763f4a740a39450cd9586f5d5dcac7b1. 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/QZJ842002211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7e099f8633504477ef6b3ecbc4b33ec134ed779049c7c698ff2837ede5921f0. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/QM4TW1788441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbc6d582dbb33cac2eb1fb94ce6c25ddfc20f9f1d13dc373a323bd46ea1752bf. 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/GBHH81300062.