Mandel Bruce Patinkin (; born November 30, 1952) is an American actor and singer in musical theatre, television, and film. As a Broadway performer, he has collaborated with Stephen Sondheim and Andrew
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 0xd1c42c382a3cac356f554f8d8c68244aca1b75381dd410906521a1e1192f2906. 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/ece64e39-17c6-41df-93b9-e5540b9496e7.json and https://artists.proofprofile.net/proofs/artist/ece64e39-17c6-41df-93b9-e5540b9496e7.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 0x2bc93e463823ab10f640e5e043b8dc4c97221e62e5aa91c65d484b544ca4fe2f. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USSM10203278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34483ebb3b35338b954f611b80a2536ca0b23f6dae77f10d7e1c2e5a4e787909. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USSM10203279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c6a1a9eca145a1cec2bd0bc0c75d589bc68f21dae90814066958a910249c6e2. 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/USSM10203281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc21d90907c420f6c1612c42f50731c00f4dff47b8b5934c9b11ff5a4d8a2bac5. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/USSM10203285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60809a3eaf03eff580439445beb5fd2fc7797f3c5ebe3b7fcc732e11abc974c8. 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/USSM10203290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7399f7b64fede229b633c9b76a7bda6624ea95eb47603daa86bf163a3d2873a0. 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/USNO19433011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5cf0142cbe121cb652e319f834ceef7298ee3c9606111b1450348b5ba4d5069. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USNO10269019.
The Secret Garden (Original Broadway Cast Recording)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1bc0700b55609ea1647ac506b2a64375f7cdf0833511da4275f15c6e6466443. 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/USSM10028587.
Sunday in the Park with George (Original Broadway Cast Recording)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631fe6716c68b7085b565b50a3cb044275396d93bdaf248668607117bce4b8cb. 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/USBC18400150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54f191e9e108035f307acc61335bbe10073c9826af5ffb8af0171ad261da7f0d. 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/USBC18400144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba114e9672d277c1d13eacdb4f46223b2caead757fa20d9f92bb2be494692cb6. 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/USBC18400138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5df84f42b2671cfc4acf9bba7d9ac286ebeb24f14c12237462a377d271d7023f. 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/USBC18400152.
How Could I Ever Know (From "The Secret Garden")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4740d7c6d58688f6a1fe0f6968c91874c2278476f3ce27bc8fa61febf45d58a. 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/USSM10028408.
Sunday in the Park with George Original Broadway Cast Ensemble
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cff8b22f9bbb7ea8eb2dcf35229612f60eaf12663a2e79e9d525a55b8fdefc4. 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/USBC18400146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e8bf9d00d389cf362940d5b82a4adc3c2edd3996f6854e7551b540f8e651a7. 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/USBC18400140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x137f296386dd553541c247ba8902ab44d1076b2f8bb8e4b02198c90fe05909a2. 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/USSM10028396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0887cbec801d7378a632151de9c7f83bd86c46b9b65ad73b63b03284bf94571. 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/USBC18400145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9779f720afb87cb99a9a6c63d74ceccd877e64b9eac71837be384150d4e66a19. 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/USBC18400151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cafe935aa6d8032c28704e8b53e0f7a31a2f47472e92ba2f48345e50ec9934d. 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/USBC18400153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e4e1e9db4d9956b6a722484fbe4f85a3ae39930d366a05d7ab831432d022e9b. 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/USSM10028704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc508899b22fd9eb01fb23de757731f24af7dedfd907a994d27cb79c65f91c3d. 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/USBC10100392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e1551482bae385a3f7a46e1aa481642c97372e9be26314d9f5e44bfeefea177. 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/USSM10028407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef605840902e41fc95d2d3cd1178b53a0f967c00a8c59c005aa5c4e9daee90ab. 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/USBC18400142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c99154aebd413fff561eef789d77972c359005c587bb028560bbd47ed31d021. 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/USBC18400148.
Scene: Archibald's Library / A Bit of Earth
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b756f7e6742b671122a8bf03ecfdeb6bd1e0f518409acd308e071569cb55f95. 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/USSM10028398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc7f03ae9200c501cca8f61392d332666c81f320bce9ff6371508995e4f5f58b. 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/USSM10028404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9de1761a16fabf96531d00159c9033805880c270bbccff655d5096c5b4febda1. 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/USSM10028482.