Gertrude "Ma" Rainey ( Pridgett; April 26, 1886 – December 22, 1939) was an American blues singer and influential early-blues recording artist. Dubbed the "Mother of the Blues", she bridged earlier va
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 0xdaa30a5055cea164711cfb2fa6c29f908146d9d2c9ab815aca79dbb36a424d47. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5c2c03dd-9c2b-4d88-8f29-7f7ac4d3129d.json and https://artists.proofprofile.net/proofs/artist/5c2c03dd-9c2b-4d88-8f29-7f7ac4d3129d.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x962524e146d21e092e6528cea865472cf1fcd6a302ecb13f64fa8e40b19f6d68. 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/DEXO52476582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2667a6daeade52a763e92e5d65df88643212d2558de236f7ccef73e22194ca4b. 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/DEXO52476583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65066b188e15f4b8d40528ee1b02f94a1cd7a91c59b9465a7e582867d36a31e1. 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/DEXO52476584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aa2d569230208f51dc0b4b013ff5dc54ac32a6000dd4be99f9cc6454d5e88b3. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/DEXO52476585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aed0d91b439de1c2416aabdde8f990e2d8de99122c99cac996fe7b89f9fc423. Chain 2 (Bitcoin): anchored in block 957874 (2026-07-13T15:43:57Z), 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/DEXO52476586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x982fe5cdea72b0a9edb8ae071b676daa750a7602c29c4e2510d1a3a5f29e5e87. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/DEXO52476652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x585e38f4d8e2723156c745f913717a5e922a824230fc7dd67762dc7ce3b263c0. 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/DEXO52476669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43e29a578ac3da884e4b40f8891923424e3fc7efe54e0acd14cd8ba54b8c5526. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/DEXO32237362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee69a02b8383c754e84cf00a089a2413f1670c650cfdac219cbc7c939d1e3daa. 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/USFI82400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf10efdb6ccf79d6c215042e6445088949919eaed8d5e23e1b98c106fa8966aa. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/USFI82600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdc6c80e4a03f7a09e640832d694764843f55627a8e055c0fcdbbd7de0917224. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T04:09:09Z), 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/USFI82800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcd29a3540b72ccbd171b236ed3f4cb2b012db3018917166b7325ee501a214f5. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T11:10:48Z), 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/USA560530467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74fa951c44ca88acd915000004e1a5b59b56e632bc2684d1cfe7de839c58652e. 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/USA560594628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x832bf10d82d243974550e75560f63cad3106ed5f6c670708eb75eda9c43f5903. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), 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/USCGJ0697988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71570ee2b81effbf35ec15e5298ad70cd5d80b0c3ac58e33655d185073916983. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/USA560662189.
See See Rider Blues (Classic Mood Experience)
Prove It On Me Blues : The First of the Great Blues Singers
The Essential & Original Southern Blues Collection
Midnight Moods September Blues - Ma Rainey's Timeless Tunes