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 0x1834e96b6dfbeae21abef91f642412045071166a91e467ea327da465d217ef3d. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ec2dad62-c249-4d2e-a78e-5762d9f4d4c7.json and https://artists.proofprofile.net/proofs/artist/ec2dad62-c249-4d2e-a78e-5762d9f4d4c7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Exhibit A: Benefit Compilation for Southern Poverty Law Center
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 0xa9a4105b0503d75a0282ca31017d8cb2088d4492e33165037c5bc1944c6bd731. 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/QM4TX2220127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23e55757b91afa0a23ed770c3898fba13a79b006b6948513ee0671e630275aac. 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/USY252021784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa876fab06203e851c2ccd00bb250c88481dbac22171fbc717046099f0dad5505. 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/USY252021785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x308b1d126b9850f58bcaa3a7287b214f3f0f87bd7f6b7befb700852cc49eedf6. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USY252021786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a2ee2c9e365af1e597ee00ecb91460acc30a31e56fa2d3717aa7ef70802d431. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/USY252021787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0b8941909cde4b0c6a74c380e3a7864f58749a93f151ec085396b8f3354e4bf. 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/USY252021788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0e4dad81562056ab0dfcc0c391a22cc2deea46e15d8c8f400e07d74df637352. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USY252021789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x381715ece8e5a6ae4a4768540d474a94a370f448bbddb93c88fb1bfbd36b7210. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/USY252021790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f6ac8d58d4331c39bec5b56285ed358316c1705fdd99f6483f0c01c7816498c. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/USY252021791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f48a7c6732a463f28bcf2071cd6240a3718f774dcf9396aeea95ab4c49ab9e0. 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/USY252021792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eb4d5a97d5a76b783ef4d3b31faa7a210095fdc571ab2d24e9f0485beb5bb5a. 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/QZ9YE1800038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93f521a84bb95973fadf01d5570cea3ae9cc93d660fa8936cf2474c9c5d7b9db. 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/QZ9YE1800039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0315d0043d68da023c6bce23463088cf09ef6b86d8d0da1b428d303d7a84ee19. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZ9YE1800040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdccb09588b55660072d2062d567d9cdd3a6f62399b566d5a4882b306b3ebd9ff. 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/QZ9YE1800041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca665a6d9ebe2af03f2ec9a458fa378937e9dba76614c82a57b30928c080942. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QZ9YE1800042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66d59433fb96ee06193675dbe8202e7dcbcd43ee913984207f1edb73e8e6a7f8. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/QZ9YE1800043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55b64ea8a230553667357bc07582ff9d6c75f7d71f2c3bbde5acbdf8513a4519. 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/QZ9YE1800046.