Ouled EL Bahdja was a supporters' group of USM Alger football fans established in the 1990s by a group of fans from Casbah. Members were known for chanting songs in support of their club, USM Alger. M
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 0x51ce2a415c325ecb97152cec9a0d89e1b0dd37260ae2fdff75bd0455e48e91d2. 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/c9512a18-2764-4408-8b9d-42f7c40a2f17.json and https://artists.proofprofile.net/proofs/artist/c9512a18-2764-4408-8b9d-42f7c40a2f17.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 0xb988c4e1faaf2b6314c09264ae3cabb55e40e37206f595fee50b1bd2ce8c66b0. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/FR2X41988512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e9361ce55b9542756d1e5a562b0c723609fab73877843e7c177e43ccd1bdffc. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/UKR6V2090760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec67601eafc6c69ccab70855125d53b9c7e4f3832ac80d8d01b8ca094f9f5ce1. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QM7281546383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e68113ba48b8a18f5485a4934086abce01aacfde79f1704c42a898002093f68. Chain 2 (Bitcoin): anchored in block 956405 (2026-07-17T04:36:25Z), 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/QM7281546385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44735e8dc8e28d72d4a319fcdb18ddcfe093e54b42c290e0902af0f7c1618a3b. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QM7281546387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d14a5232ea4f7a10857f5c6ad806ee61209ff722da7a6f309b350cb9ebce2c0. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/FR2X41626105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64e970020a1145f462565f4b02e3a03d7021467ad284a19795199ba6109dd01b. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T09:45:47Z), 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/FR2X41626106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88fbc52762f6184b7199a6e8278d7b04d3a46fb844b6072ece6046fd373d6a23. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T21:42:23Z), 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/FR2X41626107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1abdcf110edfbf36fd0fe71ac51ea03844df2faeb9c206db0e2c7898c14ee9a. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/FR2X41626108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85a741edb8163d69a72a67b683a58741374b0a1a94fbf20ab5a2f95123a8e771. 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/FR2X41626109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaa23e5a2fba72da72997a07d520e4d599ac9bb5319ef2db2e4cd51734c89c7c. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:12:05Z), 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/FR2X41626110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc883a56a229ebea265deb3c34bbe479515369a6acefec1701c35b7fab087f5fb. 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/FR59R1760787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4afa194ae738ca2910bc383d6bd2853dfcd53534f9851572e16bfba9976dfc98. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/FRX281733908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef3d74fcf010c297d8074ee3c0522e51da6c4d2542323a33838676439234376c. 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/FR2X41969580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x917f12b7c0f4fdb46caf2788b21951f73dd538f2aa30b705bd2fe39179e0bdb4. 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/FRX201937856.