13 Block is a French hip hop group originating from Sevran, Seine-Saint-Denis. It was formed in 2012, and is made up of the artists Stavo, Zed, Zefor and OldPee, all from the Beaudottes area in Sevran
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 0xa45df508646604615bd24dd6dfc9f88d4f49f483b035e577c61a9ae309c47eea. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eaad1be2-b91e-4bac-8a9f-47237b5081e1.json and https://artists.proofprofile.net/proofs/artist/eaad1be2-b91e-4bac-8a9f-47237b5081e1.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 0x239838b48de5d380d3673eebe23692ef6ba166ae8befb214682ed39a0ec8b001. 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/FR7KW1600011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x325a085d16cc2743f2a275fcbcb3ce4c4eaba4039b3a9737f5b5c092f8dce51a. 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/FR7KW1600021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x557e15b6334b8949914eb17dc4d5d6314a434bf017a7747eb17c2aabf6bb5f2c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FR7KW1600031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f0bb43fb4f9f7e83c86752f6fe57ffe9cc66f34d2f7828567b264ef0efe23c2. 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/FR7KW1600041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x557303634c1eadd8e24e11854facbf164148f7c6bd9c323d9f22bfd6009526f9. 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/FR7KW1600051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3837fae237b2dc86db19d58f1226c91f35000d445904148f0bc834c9846b568. 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/FR7KW1600061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x177f0624cd02cb0b129cc7a912cde6b6324e81eb4d1b1e779297444ca2f035ae. 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/FR7KW1600071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90232cfc4b5adbe825938019556ccd3a36af495c7ba49e3ac4fb275cdc6fd0e4. 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/FR7KW1600081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x383c86a9395e35c5aac9cf2e96d50626355571d6f0aff2eda259be82ac157831. 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/FR7KW1600091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69b33fced8a9bdb2c2f8a860a8802d3074e497e8f5bd1a6a2d60d6f0a32fa49a. 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/FR7KW1600101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc502564ea858aa01358a275046f1f27600835a689cbe7f0c4feacdff7dcced6. 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/FR7KW1600111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c2148c48348fdfecfe038afbaf8e88baaa3a1630e85f9bca46ac546ec1bbc8e. 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/FR7KW1600121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15bc848f74ac7da041fec98e33ff0a81d007e51a256674c7f4eb0c5e9436853c. 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/FR7KW1600131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3dcf920fc183c42bebc6e8b3499ecf20d47d11a5b9ffffa69735f41ad3bf1c1. 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/FR7KW1600141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0d61513538cb6f7fc746a7eff6beddeac9bee6742651f67baa305524a36df4a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FR7KW1600151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d0c821c205590a7f3ab4110cf332de8517ca8deb2e6cf07e661b72a34ef7ebd. 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/FR7KW1600161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e609c98d47d27e804ef99f35ba6f98546c68771272b85cbb1dcb027ee9d4ae8. 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/QM6N22213480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e609c98d47d27e804ef99f35ba6f98546c68771272b85cbb1dcb027ee9d4ae8. 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/QM6N22213480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35b05bf692cd3fef4e3646a04aeafe0d472b199daa563404393a072647475ba0. 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/FR9FA1700030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35613d27f112aa1857a93f0a2dedea6db91962fa438e0971b113455cea3040e6. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR2X41874174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66e7cf1c520dbffa55e76b491f7127cae01492790ca455c14b238817d0e0b341. 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/FRX851700816.