Abdelmajid Guemguem (9 March 1947 – 22 January 2021), known professionally as Guem, was an Algerian percussionist, dancer and composer. Biography Guem lived his youth in Batna. He performed in severa
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 0xa99171795a9c63d6e453f56336658c2cff59e0c47c0701754fd66751886a66da. 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/e7307b4f-7989-4431-870b-42ee437256b7.json and https://artists.proofprofile.net/proofs/artist/e7307b4f-7989-4431-870b-42ee437256b7.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 0x85504f6d8ac113ed634bbcbffda97171f51eb38ace0ec069df49cc15297f1ef0. 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/FRZ339707010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a527be1cf32e2f5136ae6d89757a459646e543c2e88a2d04346042f94148b65. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/FRZ339707030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4e3948ff5995668e98b97cf602fdaf985216f5a5d0a7da2e1c9f40a4109bae9. 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/FRZ339707050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7d65436a0a2c5e3ceb81000040f84fda7368300142b5708d213580bf2c5a47a. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/FRZ339707060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ead2f983f95727a43933b79f4123172271811dec4931f1cb549eeeeb78c3e6c. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/FRZ339707070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a5600e7ef78edd1e844727474974fe9c4816ee6e546e9381a8a573aeefb61a9. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/FRZ339707090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa929e3fe4ad65b13b7b18bf536daaba1016dcedeade4de789eb39086732b0932. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/FRZ337801010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a26b112fd4f2e548ee636e65460ad2c0c81a5f50e64aa3cace3448572596b81. 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/FRZ337801020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c089b7e0ed208182969425a1c15180994148573cc0a2d769bf3046999c6ba05. 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/FRZ337801030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b7c6d0596211ab4c3e198c056b7591863dc657f2b5fc6f1fc668e32471f410b. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/FRZ337801040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda9ba5343f3531d7d315d5ee7f47661968e2e58e434891f11b0ae341c906632. 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/FRZ339902010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20539e4f000df4c03d57f4bddf295f96f89ead5ff84122a5992dc0eaff45cbe1. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/FRZ339902020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf5354873f1acb4d016e888eab9cb513640512d0284d9f061654c5792da66c73. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/FRZ339902140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f00bb84024abb7d19f02161466fa3678c4a3bfdae66fec365ead03a0686e748. 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/FRZ330207030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe58cc5a42125bbf77f977312e0522d1498bf876d630224b4b5458c49157d90ed. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/FRZ330207040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e32bd5fd0b43a817158fea93f9d117040e8171c28ceefe6d78d0d7d50817106. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/FRZ330207050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a43036438a2f6b0e87f69f2d1a040651761d5c005fed584788b4c252a975f45. 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/FRZ330207090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe32d2ee91bbd5cd99a02fd2f326ff1615e4cb54eebbb7696627ebc5e395772c1. 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/FRZ330207110.