thumb|upright=1.35|The first tank to engage in battle, the British Mark I tank (pictured in 1916) with the Solomon camouflage scheme A tank is an armoured fighting vehicle intended as a primary offen
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 0x4cde042fd291cc9c40424ec02287a899b702ff5041b01b67bd367a53c0be9495. 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/e0f0c8e6-39dc-4ca3-bab1-2f7eebb3be36.json and https://artists.proofprofile.net/proofs/artist/e0f0c8e6-39dc-4ca3-bab1-2f7eebb3be36.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 0x89cf51791e994f48210598b38920332aafd991845a0ba79c60970660cd0e10eb. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/USUYG1352989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a3f27a77a468f0068a55826f4142672f6221e0acdda8b4a361b10ddde14334. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/USUYG1352981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6414e4635fde505845c3cce6b04fa5fd134911d8268166cf9a6a65519c4319e2. 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/USUYG1352982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc31d290616ade1875b26418f82b83bfcf92a706c25332d66c9590ff7a0f9df60. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/USUYG1352984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb1879f8e2c2acf381a7f115728f964a38c91b097fc33ef604593bf150736836. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/USUYG1352988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f4f8c2228f4809a0ec4b927069c066d6541df3c8f2d61fea3b2833846c7cfb. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/USUYG1352990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d14a50db4729c9e48e20d15a916ea6a5363dd96a3828588277b14e7cd6ef106. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USUYG1352994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdddcf6a61c73fae1f14d342637a8f845e315fe0dcdfc39556fc58ad4d501d819. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/USUYG1353007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6447f985f2e327a8c89185ebbd509141c22fad91005b3cf63ae8a1cac108d2ab. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/USUYG1353009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x027b9c2cbc18968dc28ac2c02de0f639305f9e43a3deedf4e98044dae09fd623. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/USUYG1353010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x219def451b69c3263c4d314bdbdb272f3d6d4ba4a84f158e7e2a18b393965d9d. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/USUYG1353011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fe064627f67fde71c3ba436cc1da966a1989d0ecb6dada4fdb4cd51c126af54. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/USUYG1353012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x749bf3a40cffe3ba1c6cdca59fbd6f04a74a7324cbec6eaa532dfcc273f600e0. 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/USUYG1353015.
Let Me Live (feat. Mannie Fresh & Jazze Pha)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a88e39b5519c6046fb01aa4492fbce2cdfd576f470284d4531f207df826c086. 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/USUYG1353016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad7f14f87899fb4095f2f9d2ea14666392009d82d269f3fc54d33e0279193070. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/USUYG1353018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b7099cce9443e97e0612eff95b1a048b078f64635740bf6b67b59c621f6f01b. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/USUYG1353019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a7733aa00b636ed298f102e8ee1b99973c4f7f677e0fceea89fe5171caa10f6. 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/USUYG1353022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a796746e37cbce3dcb9a2b52d641ae9fef09267f9bb6c05240b7557159852bf. 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/USUYG1353008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3158b996d25a5d9313817c1ba01899e38f0cd92d8a70debf8b0113dd944097e2. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USUYG1353013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b16550f189b7239ba26f531df4997a29dd0b550b06cd43e9cca550ffceaeb4d. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USUYG1353023.
Tank's When The Hunter Becomes The Hunted
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd598b42e3b848dba7e2d2d6fee3226a9b14230057937cd2caa189f3d591f0e79. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/USUYG1353025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d73fe5965fb1ee501687c207a262bc870a7c93aec9157442f9f4ed393245cb1. 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/USUYG1353035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a60bd0b7b1ea0230b43d383dd02cccf0f671bd747021406ddece0951e7e56f. 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/USUYG1353026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccdf8365d57ea354b0fcebbb09332891749660f02fe08e2d7a35522606721124. 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/USUYG1353029.
Shots Fired (feat. Chris Brown) - Single
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1be06aba007462a0803b7306f7fde1d605db959c350a5e8c519448684a0724b6. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/USUYG1117877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48f61ac42591b5689d55e4b293d4b2fbf9e784a203ec060c38f4c098e9c6171c. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/US77A1100034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89165749d0473cd54ec718c162eeda9ed64b417cd6a792d2749d4091d2eff3c1. 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/USUYG1127610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcde32111a23d7955c7d270ef418900f3b3d61966dd83dfdb1f8298ee23565df2. 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/USKO11981967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3af68ff093b5e7df456935c006d56092286e0a3068c48648c89bac85c68c2b0a. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/USUYG1013141.