In OS/360, System Output (SYSOUT) datasets are spooled direct-access storage device (DASD) data sets managed by the operating system. They are despooled by system output writers, which typically write
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 0xcb37cf0a79a3ac8bcc9066884b50b8ae1313b7bd9bd2b1feacbd9b1453bbe7c3. 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/d64090fc-f7d0-4b93-8440-e252b5924a1a.json and https://artists.proofprofile.net/proofs/artist/d64090fc-f7d0-4b93-8440-e252b5924a1a.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 0xf0860e280f73810bba3c83c55d02eeb7bd0e0af334b65dabfb1ec04f205bc60d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZFZ72318271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9316e5fcba179c4e009f14174b211a67d52d7f3946bd0dd558433e8478063f64. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/QZFZ72318272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fa902373e67fced4f3e4e2c1aa43ebd4be915c43f12204dc5e9b8967b39ee7c. 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/QZFZ72318273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c172af823bd636a77bdf6f367d974981f242210bc7eb6339eaee79b57b9d0de. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZDA42366728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f6d56831059df180c0a64604d8885ba50d740aa600fa48616a67b5d3538dcb. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), 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/QZDA62367380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x407d3859592228c0e47392254efe1a5c5e22b3406f758331a516c4bfc73b0606. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZDA62367381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa443282738bc65b7db184816b905b10c1f0fbd83703fad7744cc4dda3a6c110c. 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/QZDA72346195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e8f321caa06df13b54eafd73c942b3291cc70429678c2b933294a433bb08f1. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/QZES52340480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8787c257c8365eb00e041a2cf8f689d009641dc6b7e86610e910726de7f263ec. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZES52340481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x290693d2f73c0bca7c2509447079841cfd680c9abd08d7999a4a65a91c579278. 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/QZES52340482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13d1811707275a988b632c8e00b0db981961ddb380ac62428d7df23e71570dd5. 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/QZES82303801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8736d71fd35091f837270a6d0e20252dcc599cbbe326df6eb102cc8a7637c68f. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/QZES82303802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ed4502f8f0a6b3a861e75be2b287c4b64bb0b819070ee557df4395a44454643. 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/QZES82303803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19fabac4bed926754c996990d7fcbecaf14873154def91ac49d63389e9e19072. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/QZES92358193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1469e870d7b0ef5baacc6c1425d70f059dd3fdce9e6d519091cddfe84127ae2. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZES92358194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c093620954363b9807caad9c150c713dfae9f856c345041e4a9f1540ac86293. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/QZES92371500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb11a2c3d6e841fab0f30d31517ba0a6b70af56e7bc3280cf6423f0ba249a0ca7. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZES92371501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd59a046320053cfedbae3b634a2c213fd75a3abd80a242f7e3d332183b049909. Chain 2 (Bitcoin): anchored in block 958971 (2026-07-21T05:04:56Z), 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/QZES92371502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e2e665abea421add27520bf267afb236661ec75c0a4167e2495af3a5c59ec34. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZHN42351936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e9804fb413c0466686c2ae8ed289c39b37aa65e8c6a95c4b69ddf7a391729ca. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZHN42351937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38ff4a53170cc1b2d17f8f2eec31fa14906608481ed3cb53ec5de010fdd64fb4. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZHN42351938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x968758bd1aef384bf698b49d3dd26e3c0455c2c6006f69f7755efdcea9f68cb9. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/QZHNA2382792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7bee198d2a0af1708fc021ba8617d13ea5d47c2502a009982b0481a47605a7f. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/QZHNB2308247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe34b834bf60e3553cb7e32c32907e3a8b0e4d45f6073014c111656a9d47661f0. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZK6K2348169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14ec5e0f558089e0f94bb36226ec626f37b5b202318de32ba443ff95c83ecc78. Chain 2 (Bitcoin): anchored in block 958696 (2026-07-19T07:45:31Z), 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/QZMEP2349817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94c8a559fb827dfc81a4ab80747db89749b48ab35eb9739a0a6b208431bae7f6. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZNWX2310625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1180daaca3e8297c2f4335a5c45df2614a603da7628664a2f8f56dca6e79ede. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QZNWX2314532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdee6a6cb2e8e51820aaea332ef824bfe69e72aac7c908e22a8e1c53d5eb7531d. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZTBF2361462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76fca9d59514f7ae61475a4eb9a75f3cf9a5ed57e1012b637cae88c49902fee9. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZFZ62485043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f3a9e1145ee2821b4e90ce3263663fc423ba5917ed96430d105fdce3e56604. 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/QZHN62483761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f41b5236fa6b15340d0bc88c49e8a490d5c2f73e982f9060c2006473c962c38. 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/QZHN62483762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x460fa38470229e57843f0bc149c5a8e87bb0acc423bf16d4cd37ae75b5ed1410. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/QT3F42461883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe09278c2eeac88cff40f7feeefd0b229f3ca75e76caec4dcfd013d1009f1a4. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZFYY2577709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x144450ce0f46906854a81b930a82075a1072472b6855ce83bea9d5eaef7f381f. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZFYY2577710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72968009d11a3fbbe3093f4ce9fdd3464a37d48c6336a2d81c98b911d304094b. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZFZ72509677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41ea2387f411559474c538c01c65f36ffe804b7437265267bca2f3592e2ce048. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZHN32523423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaba6e50edc060b653d68bcadf2541b47e9817c97a24a1beea149752a8e0559c. 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/QZHN32523433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b2216929f534aa666bb1cee9f2b0ca17ca83a0a9b2fde69a6fbfc2e01821186. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZHN32523437.