Elizabeth "Libba" Cotten ( Nevills; January 5, 1893 – June 29, 1987) was an influential American folk and blues musician. She was a self-taught left-handed guitarist who played a guitar strung for a r
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25202c2b3e32183e0a0aeb8fa31cbd35d54f6908d5853151ef59a24f8f81e37e. 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/a0b84a14-2998-4f8f-b812-44479b3dce0e.json and https://artists.proofprofile.net/proofs/artist/a0b84a14-2998-4f8f-b812-44479b3dce0e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Elizabeth Cotten, Volume 3: When I'm Gone
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8701460247de16dafe7c9c3450f71348811937b3f8dc0ef2d0f8f728c5bf68b9. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T14:08:35Z), 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/USSF17953701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5371382f2bcafba840202eedb99481cbe67cc7a5b043dbcb6d632c0464aa1dca. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T07:30:00Z), 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/USSF17953702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde5067d3c26f545e72906198147cacdc5a64320d73935e2b3eefef747bf1e386. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/USSF17953703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa1ac4d01699578af28cd6fbbc363e1f1ed00e910d5669d7238c7a4b3df696ee. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/USSF17953704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc61d2a06abde74ad909f28388d70b57066415619b2d1aa9f162053bb844015f5. Chain 2 (Bitcoin): anchored in block 956405 (2026-07-17T02:22:00Z), 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/USSF17953705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed080798d516fb512ddc826e2a0a10ecf2cf6318dbac0043206c2fed461cb723. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USSF17953706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57b81186c3a0747381bb273fb8a26eec49ce71f04e79a1383e6f8cdbd7fa15ef. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:40:42Z), 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/USSF17953707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1dfa7a54f7dfa23abfe541648978172334c18525f5adcc98aad261227c3444a. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/USSF17953708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7161d6a4be2558f6524a961b2f4ae6032dfbb6d1d02c07ddd0aec024703bdc76. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/USSF17953709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54aae03cef2700846ecc7000fb637f1b079183c378b8318400a7916d9b2e8b83. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USSF17953710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94b7349e4bdab036254e5408c8b5082fa7b4b0ccf6bde0ff7d41f2f9d8d5fbf4. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/USSF17953711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x991e508be4735c5b096cbc177b53e1302abd4f33508617edf32332921e64a678. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/USSF17953713.
Freight Train and Other North Carolina Folk Songs and Tunes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x139bdde9605b561cb8c7806e24998f25f4ed1c5514612d63a72a037ee9ef4743. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USSF18900910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdc596ec00afdefe56fba08c73333897507c69a1b1e07463deff595c918e5cd4. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T09:48:29Z), 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/USAP39847701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7ba8f4830b3d745dc24fb088d8bdcc02e53179ef2e8b1492e6c8c4c6b09fdfd. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/USAP39847703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9004241ab7f5768ec1f902cfc8782b46cae0b7372984eb6ae20ab618ac5b08ad. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USAP39847704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aec9f5064448b6d6af054611d0737445e60030c642ff42d1c27f283c31be12b. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/USSF10414705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aacde6de12bcdac5c1d62986a9a4c6107a362760eeaf91e320bf5587b9a2318. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T12:32:57Z), 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/USSF10414706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bf971f579b70d9bc9f9a48ef0a900ea9e0b541766ddeeeaccb3d537da6d3ce3. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/USSF10414707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36ce728224b7d05305da5ea88422ccde55356520ac47ddbb5dee6fad3d071bd6. 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/USSF10414708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cf7729b2c391ae3f6d5a27ae80f8dab438abaa5abb90a86b2640ace6e902c5f. 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/USSF10414709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81ec917e7b60d3350f7534bc5714ff2de97855366e2dfefaf2b28c40e39ca329. 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/USSF10414710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30be4767ba1b668eca19536fb918f32e72ea86589c1a97ba97eea0d319c4d133. 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/USSF10414711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x318821ef5ea6b023255236c9a7b52accde1c2598fa34f72ce3653baf9a73d84d. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/USSF10414712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6308b1097d31d51093e844047cd549fdb214c316d05849e9344bd25d3bb43aab. Chain 2 (Bitcoin): anchored in block 956841 (2026-07-05T22:14:35Z), 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/USSF10414713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6c6c3d26a515627c30766ca8e000f55c01f516242205450855d1a44577b2817. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T15:45:03Z), 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/USSF10414714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6f3cfa96ea38e14d981ebdb526fdbfb9cfd07a7cf74dd1403ffc0a8afa5b1f1. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USSF10414715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a7d9ee274ffe300a449d5333a0d68dc70d9ba1ef2b225f479212e9b784dc490. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T20:38:58Z), 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/USSF10414722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bcc2390d28bfe4adfb141643cc701a1942c18341cf636748d3e396c2b9e7511. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T12:00:02Z), 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/USSF10414723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51fc00b1648f89df61454b1e2fd109cf327ade24908c6ab1b5334352f4284bf6. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/USSF10414726.
Freight Train And Other North Carolina Folk Songs And Tunes
Close to Home: Old Time Music from Mike Seeger's Collection, 1952-1967
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d656d7dcc52ea9d267c62d2e3fce2fd40a6b1ce5f67c758e8935a390b1b18c. 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/USSF19709701.