Walter Van Brunt (22 April 1892 – 11 April 1971) was an American tenor known initially for his recordings on Thomas Alva Edison's Blue Amberol Records and later for his role in a scandal involving a s
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 0x1579214ce8e179b92ae157a6a9bfec06801f2fddb15e2ef3c7b6d3b5f7440060. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e80444e6-67e6-4ff5-ab37-7c7571624f31.json and https://artists.proofprofile.net/proofs/artist/e80444e6-67e6-4ff5-ab37-7c7571624f31.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 0x780eb2c4a8e9e247eb964946c40846b0309c6ba197a6ab8e04806529968deabe. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ATR981126565.
Pack Up Your Troubles In Your Old Kit-Bag
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf191cc5c00c5d4022367841f8ed94e810dcccc4414500cd330e8f11c624e21f7. 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/ATR981126566.
If You Were The Only Girl (In The World)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53f5ec8877856000ed4bc53b58a31d1c4a348417877f372359e066b79e598eee. 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/ATR981126567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fbbb3d8df6f1367fca54db06a6457a1973e686479b4f16f522a59d1dc3aff4e. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/ATR981126568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01a6d425d5ad33dc6e8516060603d2216b2bf7c87601e1ec98ebd65fc80fdf2f. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/ATR981126569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0a0e841935344779491f39dd338140539cba00eacda93b70c85e125103b7c7c. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/ATR981126570.
Keep The Home Fires Burning ('Till The Boys Come Home)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdea7aa49066dcb81780c78d809b7a05357e92b08d21ff2d279f7e43ba6e8d56c. 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/ATR981126571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x272e9a3119482d22a0a53281dbc5aee8310a2abc86932f979ea83ceae0d07221. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/ATR981126572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16f87c0cb18f65a4395d64951c141de186c1a325abfe4368dc7c76b712a9508b. 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/ATR981126573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dbe35bbfe1cd881c3c016f565fb4df190d82526ee12e04d667bae1042374999. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/ATR981126574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa163d33d49d321167b667c7e82381d97e0613a66ee1de079a46185deb884ed57. 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/ATR981126575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b89e85a3623e923888b7c6d51181b6a2b0b21e62673e84d114c63181e475a34. 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/ATR981126576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84274fb72298893ec3cd855cf11efd66e7ac6dc5690db5f50e40d25baf0b39f9. 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/ATR981126577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x096e7c5ec49d65f0118ccee79da98c5cb77b1a1fbe6dcbec29f44472a4a77944. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/ATR981126578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a2f644b84f966c619ce393b52da10e42e23d26c560cf6c32cdbfdcbe76c70f8. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USXF21801640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8739d7a88f0514fac970f283acd56675e21120009f99616526b162114eb514e0. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USXF21801648.
On a Beautiful Night with a Beautiful Girl
Phono-Cylinders, Vol. 1: Edited by and from the Collection of George A. Blacker
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b03a201750c1610721bf9ab718c0b4f8fa52d3b56dc9c04db26ea221aafb041. 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/USSF16188603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeca1ba72cc46db45af1118bfb51323a1210b910ae9affcffb02b76805ef734d4. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USSF16188604.
"The Wibbly Wobbly Walk" Novelty Numbers from the Original Phonographic Cylinders and 78s