thumb|Trinitrotoluene spin view Trinitrotoluene ( ), more commonly known as TNT (and more specifically 2,4,6-trinitrotoluene, and by its preferred IUPAC name 2-methyl-1,3,5-trinitrobenzene), is a che
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 0x593152cabf00d0c33f1e46edcaf384f02c6fad933874b648911f9fe8a2f0aba8. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c7fda482-45b2-43f7-a2d3-1b47934de12a.json and https://artists.proofprofile.net/proofs/artist/c7fda482-45b2-43f7-a2d3-1b47934de12a.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 0x3586131c2051212cf75776aea20bd1bdd93d16c293de6e236cf1f7f71bbe013b. 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/NOCVC1443010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcde6829e9e19c9f04f2a752ac3d0c844130d74bee7c37d72ef2f2e788c266c41. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/NOCVC1443020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3122027babac9d109d056e621cb5a18461fe8c6acc764cc01dc880762951817. 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/NOCVC1443030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cea0186ec8e96f32048dba807e41199cf33d048b155b5a104746785481ef9e8. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NOCVC1443040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5fcf39a82b7d3ceca29c6340c1cfb0f35298c2f22a3fb1584538049705979f9. 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/NOCVC1443050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2649ce4d316c0fb3f4c69b1fe15e4599e0f63f9d416aad503bccf7877f43e91a. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/NOCVC1443060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64776c62f50476c7c16d080ec72da8b8552588e87aecaaccec8ecfbefd81c85f. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/NOCVC1443070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe87c3c9e1389a21e7125c708a3fce18a82a658e79d6d78fa94852e89559718c4. 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/NOCVC1443080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddf4929d8d2b8931066fcf1c8e3044697eb7706ca4463feb6276f8f944422651. 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/NOCVC1443090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1faabb216fe36c98fa3f5e709ff7ceb3f6f9960b402e39f6f45de2e6c777f9bb. 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/NOCVC1443100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56d20292ca85f2c994e74995b8026f6a65b53a62176d59a70d91f3d652cc5200. 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/NOCVC1443110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc17c52dfbaf026adae2a31142160b46336239fbed84be654174e0261f99f425. 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/NOCVC1443120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec0dcb17ac281699828280c93284780727208798947781607d5a2b8df03eb179. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/NOCVC1443130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c794f6c480423dd45db1d08795f1039f0eb9fc0d5ef8c928a061363ca60d870. 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/NOCVC1443140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90e58cda171d7866fa1f8384628f2b50552bbcbd5e66f3af07e8e656a8c08856. 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/NOCVC1443160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13bbc1c4c54a48d56202ea0777059a0ec6d91375114bbd1240016c47feec8781. 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/NOCVC1443170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ab0a9f9c8fd5fbe322b1069340edc1a2adb8cbd54368dde9d3029ef0213c0a2. 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/NOCVC1443180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36b91b6a8e01e1df0b2935d14728a1fa005c39ff6ff30e24f691b3ba53a45319. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/NOCVC1443190.