Mendy Portnoy () is an English-born Israeli singer, pianist, composer, and producer. He is best known as half of the folk rock duo the Portnoy Brothers with his older brother Sruli. He has also releas
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 0x561a7891a46845187b6e8484e3adb63ba1c628cfa1381ac39eccd5f84280154e. 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/0bc93984-c4ed-4838-b451-ceadef959f7a.json and https://artists.proofprofile.net/proofs/artist/0bc93984-c4ed-4838-b451-ceadef959f7a.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 0x56ef31a4ae2dc9f6a662457df07005b29f64aa06be4bc16a1d8ac5bfe5f32b95. 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/QZK6N2411538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd817f53a7d96de25482141c403da8746f06c3016e0fc40fb8b24defc5b5a500d. 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/USDHM2300741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd86227a4f7b08a4804d1e5d3c2e07a553fb63a54874713656cb55ed7430e8ace. 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/USDHM2300742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa365e89650cc49588f13fd5332b43fcf268fb55635373e6d842a76e7c5aab5bf. 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/USDHM2300744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fbb726e6c9525b2b2dc5de5fd1ab1acbe5fa5c11f1a4e3f17f3a8d939f8636b. 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/USDHM2300746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf733f077fe640c7604a1dceee3668201962158397643a0056fa96d31fb9f7b63. 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/USDHM2026812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa01caec44a1a78a0f273cc31af7585bd234209dba2fa62416bd978748cf1088a. 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/USDHM2026813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4edb28f497afb16fe176cff0e140aed8b85e68176ab93de9a572dad30a6d9276. 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/USDHM2026814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5345d3ea457775bc5ba0bbfef5d9e3d111bf12f10db063e951180dd6b8753223. 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/USDHM2026815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf2b8cb4f0b7d95517801e1ecf0acf04f2ef0b2f42972352b3ce5275f6438fcd. 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/USDHM2026816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f16b6cfd58f676f822b3ffac41b4d4291394e43b2339b8a5dafc65821a32562. 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/USDHM2026818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8118069c4d0153c77e556cce2433c91bf8fa08657bc8829fa0d613f704cb2926. 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/USDHM2026819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8212b3c10be6ca2b5c3e97cd674319b17f1c01ca000dd3f9df224b492148cdd. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:03:56Z), 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/USDHM2026820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6f2f3fc624a26385a093be327b18fb3b2b4a03ede5eb4e82660a018d645bce9. 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/USDHM2026821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa50e40a81f4dead326d3d2d9bbd5c2f44f4a8818cafd41ce87a7b10f400a389. 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/USCGH1553365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74ba97218ad5f36e0fa7a826f55d806eb0a69ef812d1cab437f1d66f7b607a3a. 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/USCGH1553366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1ef8d9499c5367be6ae20e0acf4020ec40757500107d26b32d90c3a155abe47. 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/USCGH1553367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44dcf8d0636aa29d33ed8fdbabeac39a19fe8794202338cd57e3b4e91c60380b. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/USCGH1553368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96a0236807163e9659b187511a59a30a1bb63a52ed5452b32be76ab956ba2c8a. 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/USCGH1553369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50c5fb7ea04191a756a774f3ec22ea21e5eceff261c9683778109216b1b0f311. 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/USCGH1553370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6152eeedfd3d1b33ed99a83c0450e0affbcc77a609eb274b3a4f6b1ffe00932. 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/USCGH1553371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce490a47046f6cbafad9e20e798dbd8ebe6b19d45f32a5ca26a5dda1aaf5f54. 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/USCGH1553372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41e29cb6764ab0d4a8acaeb5b8efaedbb6a93967c91f330b74bfb3766d02c8c4. 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/USCGH1553373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb782ac535aff7d4d3787a0fe0fee31c177253d7154cbceadb64d9f0e7980b4a2. 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/USCGH1553374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2347c007c330bfe68882d9e0a43617773251edc702014049f9d001657b7d3bb. 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/USCGH1553377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd602427a5e96118edb59d3db6608420142339332600e822cbd026b3bc2dfeee0. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USCGH1553379.