7L & Esoteric (7LES) are an American underground hip-hop duo from Boston, Massachusetts, known for battle rhymes and boom bap production. 7L is the duo's DJ/producer and Esoteric is the MC. 7L & Esote
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 0xa15652f03e817c6fd85ecfe628617342e6f700a3ce6db5abfacf31580d7a7b1a. 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/b8037f06-834e-4cc7-910e-b7ecef780430.json and https://artists.proofprofile.net/proofs/artist/b8037f06-834e-4cc7-910e-b7ecef780430.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 0x5ce981419cd19d23634d4fe4d796d4082852c9fb7b9434b382ae9fe2610e7cbf. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/US4UZ0210017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b38b61d065e465d13f1e5785ceea39c03d3972a27191836a0ecfcbbaa3069f9. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/US4UZ0210018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14f8888ae181ff1031c73414dcd2dbbb06b4e4fdcf850deb6e74087aaec0a1fc. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/US4UZ0210019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68b587f7665862f92df0040d80b9fd04273383537276e88ca3d5389099238302. 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/US4UZ0210020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485ffd84272040b32e24d1095f7f130724bf8258c3bd3f28715dd88c7ced4bd9. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/US4UZ0210021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad3db6a6dc94416468b48b6cde178d0b3fe389464b1df57883795a6b5d440c6a. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/US4UZ0210023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cd1b268b56aa48e662f26dbbcd0aedca5a792af20fcf6d189dce86d9049ff5b. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/US4UZ0210025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0bc3541ee719447207111de4da4279e8418a184d97e173214cc8ece89c37de4. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/US4UZ0210028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fd23354d6df07a1b9cabc2089369064b3c2bd595975cb698e98b25fc5871b0f. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/US36T0403107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc024cf817a8c5cc679f4462063b266c7eb19737b6d09e4bd9df4fb083f542dcc. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/US36T0403115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x233a971b16213b56f8fec56cd903e82d7068ebdd2418f7b9bf6b6d6c523a60fd. 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/US36T0520002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf1e48bdaf62b5ce18a1d66fab19b59dfce38ca30f70d6b66bcb3562de3f23cd. 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/US36T0520004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7fb16219dfa70763fd9c1e713d90f2d566c8fe4cdc69b94790ce5b1ab4c572f. 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/US36T0520009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9d5020782a4f1c034c916c37ea9b99acb12b9d6a68c1f2d88d3934a76d7436c. 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/US36T0520011.
This Is War (feat. Army Of The Pharaohs) (12")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb725234cef7c00bc4d2a28420c15543a35719d88cde05d904b0dadb991913f41. 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/USGH60610057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6fc5a4c840bb3917af447e67e302640edbf5132088c92192ccae450ab611123. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZPLS2321901.
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