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 0x8db8f6fa685d969176a53c1b9e7a8890b7833e9539ca2ce2479b62bcf279667d. Chain 2 (Bitcoin): anchored in block 953701 (2026-06-14T22:16:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/753368a4-baf6-42c9-9e65-2d92cadc8bc5.json and https://artists.proofprofile.net/proofs/artist/753368a4-baf6-42c9-9e65-2d92cadc8bc5.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 0x83e7ce021df4303a00d454d6ce43eb588d1bc9f1c90946179221d3088a8647db. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZK6Q2471110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2949800d4d29bb6f0a36f75061eab033fa55384b73cab4810a58a3b282d6930. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZK6Q2471111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc928555674a4b52f40f72c1415baf9a38a4e24c16c97611926d976d3e6b9a2. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZK6Q2471112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c4e1050f755f16811f0aa839a1092e1d4f3f9a996db46b4c80ee56fc6486a81. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZK6Q2471113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2f92d35d425e5b82f564e69a3ef227195eefdba17a865b2502a1a16c5d69af8. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZK6Q2471114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d0d54ff725b335df2e0e54f03faeecb69052526ef63ddde0b9f914950b60f74. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZK6Q2471115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54fc76eeb494c5aad23345ba0d1b26219fb0b9effd8a131808dc4c644d989da2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZK6Q2471116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc10563bd9df8710f7c255e4dd81b1236b14761b617854ec4b4950ad195d8f451. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZK6Q2471117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x323d990957793d311045b36b56624678e4750061cb80ebea7fe0559dc7d952e1. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZHNA2451790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bccffa2ef8b3383ab55c25dfd3cd91bc983f6328c1780075bbd81187ac29b92. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZK6Q2471118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65a5dc01248727a3e3ca0cb5ce9ba33e76ca51fb02980b95ae4f7e7da3f5b2b7. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZRP42162821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf9aeb40a7814b1199b1ac141b34e7322e2fb616526ec6ce57b6e2344a6512d. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/QZRP42162822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5be6c2d78fce09faab8d56bd42f18309d5146c3a3b6d89c449bbb0a927a77d8c. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZRP42162823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a3337f7c0545b517f6ff286a9a7a4875c42da90837ea03de673ba5b3e34a579. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZRP42162824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd15d77cef10fd4fd1daa75dfc78bb423fbf4f64bd9f89aa32a18f2336ad8d695. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZRP42162826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7c859eb6532b8e6f5da8cc93254ace704392b5fc577ff260ee3ac08c5175a9e. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZDA62439778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd50b66649a74b8928f05260b2c72a296609a00e0f211f9e372bec4adc6ea41b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZWFK2301904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0bacea9a04474ef8fc2b1ffaff0b35b35010848075650f788a2e355539aedc4. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZK6K2314107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe539bfcc718f15bea1d8a1e72d31e73fae2754c117a56f85274c96fc5941fea. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFYY2391103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7909555d57e60a537fcdde5ee6e5c7109510966175a275aa20f00db9f7af7d. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZFYY2391106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86392e8447210c13602bd01c63714ff321124d34ad0692bc792218bb699be872. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZK6J2290850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x778498b58e4662c46aec05608cad72294e1e7a134d6055e4ae2d1d8e83b5e72f. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZK6J2290852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87dc15885e39f6d88ceeca4f04c1b2c69037ada104929d8c407280a0a0ee7f69. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZK6J2290853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0bcbd1ef60d1e95ae1eee8dbadd2005716f5c6877af31008fb64f316dbb29eb. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZHNA2294040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc03f62f02b7252c8760d39fc6a2ea10bb769da0606f6863c9a5ebcab74c937. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZK6J2290854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0bcbd1ef60d1e95ae1eee8dbadd2005716f5c6877af31008fb64f316dbb29eb. 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/QZHNA2294040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cd12e0a74da2b1c9c0c8e370708ff09e88b21cd0834f2c0b06ca7750f89ff19. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZPLS2009414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf902d78faec9f3e190ab001e2431f14dffe5ba10f4642414294d7248a4bdc17b. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZPLS2009416.