David Schweitzer (; 18 July 1925 – 17 August 1997) was an Israeli football player and manager who was active at both professional and international levels. Career Playing career Schweitzer started h
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 0xeb7dc44c787b5ad62ee4ed84107af381b594c7fd7f5f660998ccca7960289a66. 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/0b114a8b-de93-4d32-b6be-22565e9f6f28.json and https://artists.proofprofile.net/proofs/artist/0b114a8b-de93-4d32-b6be-22565e9f6f28.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
EMMA. (Original Motion Picture Soundtrack)
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 0x2797481da6ee82da45e9f09134b910cf41a1535159ea996e29288e155d639360. 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/GBBHW9346201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c61e06405af07aa4dc51235cfd4ad0222cb84144e0ae0864e9a70be79661f5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USQ4E2005296.
Queen Bee (Emma Original Motion Picture Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd597f161f10bd3516f2c924b225bd9c3ef771f3d8023b76e6393e8e492898ee9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBKZV2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d1f9d8afad40abcb3dd348b0ada218d3cf91b57a57a9179e1bd3efb8c406d53. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USQ4E2005297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80d48c85126c1c59577ae2f4c1ffcd482390a9578b720f2d84ae5d313afcd1d4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USQ4E2005298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfccd870bdd4053e3e4b699cda5e100303d6d47c2e596e9eddb8d49b6c21bb262. 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/USQ4E2005299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85a94e4f339c686033bf0f955fe8c7a6ba0d771a9721c217cbdc2171d8a5294d. 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/USQ4E2005300.
Harriet Smith And Robert Martin Meet On The Road
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc77ca1f4e5f4d0196b06f91f18cdbe0a8edfff1594431e23eee619c1fc63942. 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/USQ4E2005301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x995502bae4cc1e8b22366dac5a946b39cac909c5c05a935d3c18f431913d3eb2. 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/GBAJX9038305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e417be11facbad1d2dd4e7f702f0abb6bd673cb23eed260feea1afd43b3a08f. 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/USQ4E2005302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac8259ff13e4ad36c1cc05585ba9f586d46e6685eef211b789b8de7912620e0f. 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/GBAVZ0145913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf98351e3e67b50457698a7037833602d2ec204886514abff16c553000a112caf. 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/USQ4E2005303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x211b9031bb58d968af879bef78a1e7bc0b43e32c1d345823522bea1bbf4a44e5. 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/USQ4E2005304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa78e0aa802328c7fb9d0836cd29d0db776708f5d5aacbd15c5c748148b28b5e7. 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/GBAYK7600072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc9f71859535625048eb37e3ac5a53a795262e3351e942c8997b9d55ed659451. 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/GBAKR9312015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa222e36d19277db936221a542567c18efc150b45b61039fd019607c6504af181. 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/USQ4E2005305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5e2950b2f3d86a38ad7990502b8010ad347ed7d5df7b92f9ed1c7072d072868. 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/USQ4E2005306.
Harriet Smith And Robert Martin Meet In The Rain
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf2d9b104fbb194af6aa8cb3da9b3813e5a7814f51190da3654a10dc0095965a. 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/USQ4E2005307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47d04d46ab4d7df69aeeaa58d35d15771cbc05716441cb85c55d0f2545adee3f. 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/USQ4E2005308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9235d1ace2063a08dbaecf35aaa717726c8446681d8fd3daa23df4258fd42c1. 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/USQ4E2005309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdacee81a40ff938bbdb69b3fce4477d22cdc653d71f8a8270915d7a2b5ce4913. 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/USQ4E2005310.
Mr. Knightley And Jane Fairfax Duet (Drink To Me Only With Thine Eyes)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf03e7361d915490981f9fc0287938467d763393ec4ecaa2be83acb93b381ecf2. 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/USQ4E2005311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a38d94a22babaf7bc5f6bddcd56ba49a31fcb69049357cc9661bcfcc48d2257. 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/USQ4E2005312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1517bacf8b9553aaa48608f838903af26be33512db1e69042c8bcd8205911239. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USQ4E2005313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7542745348ea1dd733899e41864ad9d2758ec2c7daaf88aa35754d1bd2ea3982. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USQ4E2005314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b6d0cbd0f3a7cf8545f9695f55b31767e7436bbb17acab4820f72699d6f316. 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/USQ4E2005315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c4690cb652f12bae7a3a877a56a1aa6110bbb7f004e0e6cf6608e3279f8e746. 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/USQ4E2005316.
Donwell Abbey (Haydn's Farewell Symphony)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c8bd276b125ec215b98243746874b55f930f282dc8779e22324fe7e64df06a5. 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/USQ4E2005317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d6f35f79aa08235d3a4f25d328dfdea6de98b25bd0378fd7200340069415d60. 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/USQ4E2005318.
Jane Fairfax Plays Beethoven Sonata No. 23
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb463fb2ecbaa232ec2788930104e836be28c37537566bc3bc6ac7fbf5651103. 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/USQ4E2005319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e59349ee7efb892a5897d17033f5507a26b931f0001456720390cb3f6a49324. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USQ4E2005320.
The Proposal (Under The Horse Chestnut Tree)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2c168867eef3a580e7ee25e30ed41629c4110c4b533241dc5865404453ca632. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USQ4E2005321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f219c568a2dc0ab2cc6c59a698135c914354bca58408fea77922619ab8563a9. 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/USQ4E2005322.
Emma And Mr. Knightley (A Kiss Before They Wed)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cae329f38c9f77d7020c1b4f813d3eeddfd9a674753a7303cc38fc0fe703536. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USQ4E2005323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd417e9ecdb6bb66d7483b9e9e7acae39d5b553e8fed2c81b7a4cd288a266795e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USQ4E2005324.