Fill may refer to: Fill dirt, soil added to an area Fill (archaeology), material accumulated in a feature such as a ditch or pit Material used in cut and fill to elevate a surface Fill characte
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 0xd433aa91e114f4fc394cebb4ad2f4b583aabc2c052e1236059edd211d9066d09. 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/67deb4fb-a636-49ba-84c8-0d7cab6b9e98.json and https://artists.proofprofile.net/proofs/artist/67deb4fb-a636-49ba-84c8-0d7cab6b9e98.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 0x92b0a44d9fbed1f87903cedd990942b397d347695dabaee3d70deef51b38155f. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/CZUM72200244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d18d3d216aefd4d1a49eec4661fce4cad0bc25909306336daa915fa356827f. 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/CZUM72200301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e3d1d1a8acc09bb810de0284e102b05439dac44fe84d14ed367e5dd375457c1. 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/QZYFZ2436995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42dce934a17f3b0b5d2bebb8a718ce1b343e0abc4bf54c554e6f6f38ddbbf846. 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/QZZ662355039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a6132847b353d77c2f93c99e21d04f7d052c19e77a39cb7139c100270d11854. 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/CZUM72201222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00f183684543eb0c885a989b76bc505d1483ee7b2818eaa84e388548afbe5438. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/CZUM72300116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x906622a9df6dc4af73fef6555f953be30d0652077be7aeb2cbcae48528d8f769. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CZUM72201036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfce91d51fca682d7e83b8117c8e0e04f7695c2ddb7fd0c2465b57355e318c9b0. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/CZUM72300122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e0c1b70b41e14ccd309c6c31d1f6decafccc99e5bc85f5b6235204ef6eb5cd4. 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/CZUM72300123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aea6c56e799d6df7951c39d49f290f1c40de3a1a1d0bb1d9bb6b3b61b73e627. 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/CZUM72201175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec2e65a8809be58cb7b8fbcb9f2655cada6706250d4aa9dff42d4de08046f389. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZWDW2401169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x231cb501c1d0b6a2f8267bb1a6d468ef7177fc75974a04898c27e5e8f68cebd1. 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/CZUM72300163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45552ca079079bc219a5d625fe516dc7f4c0e83dc490f3529735329c9006e2f6. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZWDW2401171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd82610ab9ecc59519c69d1f1b30e8e9bd5e8f8720323716f2d0d86b5dc5692. Chain 2 (Bitcoin): anchored in block 960355 (2026-07-31T05:49:18Z), 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/QZWDW2401170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7c933b270c82d5d05354e948576d01ec545e59ffec59529f0d8a0ce88190bcf. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/CZUM72300534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d550034c996571674e442210914eef839f60f3ca719338be2aa27efa56a97e7. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/CZUM72300535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a590aecee7eeeb6a61b84f975762e9463331470d3163fd2e43f9d38c57015a5. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/CZUM72300536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3f033f05f763abefffbc323536f8897f4357c84307941f6eebe3f8a9c6a1621. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/CZUM72300537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce0562a336c2b348a2f0b15173d4231361230ee42fb9d03b29adf097de230ef5. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/CZUM72300538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05bb0e3b6121122eb0c22ed0c0fc55d21549ad048d4ab0f1524746d2aac16ba5. 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/CZUM72300539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e9bbec21594b09bb13be6426324fe7c8765a99512fe54599d267f32c7f379df. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/CZUM72300541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2653411b7ad8dd60f32b21f739feff867dc420e14929745df894deae7e42886e. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/CZUM72300542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7368302fbd9df8e373ff5e06c4fc53828858c4744a5af4e48bfe1ee06fb548. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CZUM72300547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9946a132bc1fe9abdf4ea227193790b51d49387470ebd0db30c2099c9cd02596. 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/QZWDW2429805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6015ac1a79ef483e091689ea7768614705677bcb4adf6a6372b6fcc6283abbb3. 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/QZZ662449372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38da9e7d81dd76d14cbffd147e9dbf0b7b1974f4a2d3bc41cc416712f48d1774. 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/QZZ662411932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x790ecf8d3c437206bbe6f9ff2f392d80630b8a6aa8806ea785c2fc384d36cde9. 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/QZZ662370598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfc663254134e9689284b71e3d9575c95ba5300cbb146d4afa2f0f9b999ad3bf. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/CZUM72301181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e6b9be5d965afd77460355a294a697daeb373868971a44ea13fd9e6e3eba95e. 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/CZUM72301182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe9d77a73fb9f272de4e3ca9ff4b25151c04ebc12871c39b0c82acad666ae6c3. 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/QZK6F2428996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9213199b09cd280b8a7c3241785c12efa64d7c1afa9a8b03fbf7ee71b6368c7f. 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/QZMEM2453944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0823f22b8a549762dcae140a7f5e8e8dc34e5420c206848eb919068fb56305c0. 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/QZNWU2456560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86c0655f7a546c5f51461bed15e7664bf8c6bb6fd2e909b0546d15dd58c0acaa. 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/QZNWU2456561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6415812202c6c3959db1bfc04c6ee9a2435b894f5769d781c904d614a2b6ea6c. 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/QZNWU2456562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32abb8a9c501e318b82350b1356e28c342fbb2d573a5b94053c63af9bfd214d1. 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/QZNWU2456563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe9d77a73fb9f272de4e3ca9ff4b25151c04ebc12871c39b0c82acad666ae6c3. 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/QZK6F2428996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3dad6773ce7518def660c8e91962bfbe3503329bfd6650cdadb888a9bf37992. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/CZUM72100654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ac142a8490d9e0a827956387d284d6b4a4ca3864d7a6c8a41eba6d170b0572f. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CZUM72100657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9676bf200a3537df83aa0034f0a96beccea3f75a959c1881117efa11d48d65de. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CZUM72100661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d59526099c9ae1578db60816186348e2cd2906eb5425e586495fa533caaa7d. 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/CZUM72100413.