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 0xfe6ef1bd15c145e35669e1f0ce067fb908b285e425834e0880755872eec8c959. 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/afbe5b5a-ff58-4b45-8a4c-31070ec804d0.json and https://artists.proofprofile.net/proofs/artist/afbe5b5a-ff58-4b45-8a4c-31070ec804d0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Battlefields and Campfires: Civil War Era Songs, Vol. I
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 0x6c8436bf35b4d06db15d5501319a589a4a93edd9a233b74618fef04f60dd66d1. 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/USHM91729954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8587b48fd6fe3923ee13a940e3f3be9d6fefc5b20b0e29c8c0caa4b0048c34b0. 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/USHM91729960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe323526b0680789bd2fa4ba86d3ec21a24b0586682754ee5751e6ebbf8aae6f4. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/USHM91729965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x037c88353cb69a94e29ddf72c6945f5b0b78d4ce2dc844ca15d8228f67e7c967. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/USHM91729966.
Brass Mounted Army: Civil war Era Songs, Vol. VII
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06b5aab7beb82fbe62b895e080c36fc5081079d047d1b028163e70e35167cce1. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/USCGH1815753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x696fc380fb1b213bc489b31aa9cf6612f2bc9c01a51003c8091941bf3384b823. 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/USCGH1815759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x159bd1e60e6204b4e6d33b717296846c18e2155679742c1cc5d131511d4fb3b4. 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/USCGH1815764.
Raise a Ruckus: Civil War Era Songs, Vol. V
97th Regimental String Band, Vol. III: Chantey Irish
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6094eb3118b1a9cbe97460355f13d8ceffcd0339105598d64da7d9cd258b9918. 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/USCGH1810792.
Marching Along: Civil War Era Songs, Vol. VI
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x840c141afd79994c5cc9c34dd36aa2275b2da4ff684961df010d957287f3ccdc. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USCGH1814294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52cb381cbee4368382f80f39abf06ca41f37e8e34ac3147dd4658b7d14d8785c. 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/USCGH1814303.
Dixie and Other Love Songs:Civil War Era Songs, Vol. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf156d78abdb1800fce637b8d963df60a500311b7ab2dc2906ac7234556b3f3fd. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USCGJ1868759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x821d829f0b108ea6a51db3c32d5926c60b528c878a6550bda1735a07ebce72ec. 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/USCGJ1868760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd56bb3f348a017ed5e4fa8010d6ae4caf6334e7b5dc8edd194e09fb713149757. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/USCGJ1868763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1982ebab436a86a15d2235ca35ab16104fbf05c35c14cb3e0ef59ae0bd7f0979. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/USCGJ1868764.
Tenting on the Old Camp Ground: Civil War Era Songs, Vol. IV
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x373ae12104d31af6eeb12159d80482325a8bf57f6ae2cfbbf09280f8b55e5b8c. 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/USCGH1818096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04d6ce5f7e7416442cd84d9ffb0463315e3fb0db51ed00382e208385782b6824. 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/USCGH1818097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9822fd3ae26f1e95c3a59ef7b3e8ecf7ef95c6cb2cfb8c830f6c99882dd2b38f. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/USCGH1818099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x919b3631c09b4626a7b6587b6d15ccc345afd3ca10d3b697950a6fb383ffbbb7. 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/USCGH1818104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f38e137139b3a1379e05b58612c028846afc92a32b763560995de6a285e0cef. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/USCGH1818105.