The Swingles are a UK-based a cappella vocal group, originally founded by Ward Swingle in 1962 in France as Les Swingle Singers. In 1973, Swingle disbanded the French ensemble and established a new UK
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 0x5c0e6115a2da2f87eefbd6d7c1e9f3cb979a6f2e50eaef63c488047a7c86bfc3. 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/f01996e1-95a3-4be7-b02b-f0e0e9853d01.json and https://artists.proofprofile.net/proofs/artist/f01996e1-95a3-4be7-b02b-f0e0e9853d01.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 0x7b0551e6b773bacaad128b41016af6c6588496f5e814cfbd65a0674d3ba96cc2. 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/GB3ZT1525005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa13b7170a8354972988171aa641278d79789e22c8756844f46869ff521baaf7e. 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/GB3ZT1627002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f0e374363e4aee8e0b943853dcaf490e733cbcaa23f8771c8350ecaf265dfc. 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/GB3ZT1627004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae692e866856179e03501608f5a0fce35b0eb65f6cb8068f000dc536e626ca66. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/GB3ZT1627008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a64c6461051062e6d765cd3cc969fc256b8b3fb53cb7cd7f88dc9beecdd5195. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/GB3ZT2130003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98f1f79d07df38410d93caf2f08f2e6a7e019ef3921f05379744450a4083e6a9. 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/GB3ZT2333001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ccadfe67294f4da4cc5561211f2368e2bce09396dfe1bf1d44abd803cfafa46. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GB3ZT2434002.
Send in the Clowns - A Little Night Music
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9277e59ffe9c0446f33fd4526439f723728e2d71b5d3a49c2495c9eb450fe245. 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/GB3ZT2434010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d5d6e38b0634464cd23d4e576ce7fa5e63633e991ea14bd5be5329ab9ddf77. 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/GB3ZT2434013.
Waving Through a Window - Dear Evan Hansen (Interlude)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebadb589c33e56a677916a4cfc9c2cf48978333cdffb4e19d3115d9f6f8e1295. 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/GB3ZT2434018.
Sit Down, You're Rockin' the Boat - Guys and Dolls
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30a953fe60b61b63c582eca96a0759852f985f7f1ccd463d519e10e68eb669f3. 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/GB3ZT2434023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75d46d705a3d0313374bf8d1051340056ce0571e0b9c5aed43d84fbd355040f3. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/GB3ZT2434001.
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 0x5371f6ec324f47ced3bade551585de0805f6c822db725121828b3e00dbe5f4d7. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GB3ZT2434003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa7c68488f85a6ffbd21279ca568915907357c75b8f09497035f3fee66a71bfc. 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/GB3ZT2434004.
Edelweiss - The Sound of Music (Interlude)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86ffa808cfaa5a8e19eee2c27bd149b61fe95e70ea01c1313c5ea3e06304d3ec. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/GB3ZT2434005.
The Song of Purple Summer - Spring Awakening
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4c1179b798df5352fb298083c8b47a8e82bbbee8a4363c9b63791fd0a7c75a9. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/GB3ZT2434006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce826006cf927fd30ba1698d3b855a5fe2d3a2119deed7f8c1bf5c91e7737d86. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/GB3ZT2434007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc220807b89e97f5ef05db54ed8c634ad7857423f74af0f971a8b81a026737d63. Chain 2 (Bitcoin): anchored in block 960419 (2026-07-31T15:20:33Z), 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/GB3ZT2434008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9341dc78d17f08bd0307197c876da5fe36a5a39f057e0d9c920b80e5cadd110e. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GB3ZT2434009.
What I Did for Love - A Chorus Line (Interlude)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb05b93cf9112905f990084dc96c476dd5c9990446e342968732fd6f42444dcdf. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/GB3ZT2434011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfc6f902d76d7745ff76d405e8d7f12638e24a12c2b7793f5296a31d1d46259b. 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/GB3ZT2434012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60818e276db0756a5a3b6ffb062f2e9856df4098b9128a5165f46d8dfd5ecb0e. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/GB3ZT2434014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc3d202dce6ae325839f0298c23227ccac5c4fc46850e49b8921aa87a1b2590e. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/GB3ZT2434015.
I've Grown Accustomed to Her Face - My Fair Lady (Interlude)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeebca5341035ffdc443a5fbdf8cff60c73524f819e21972cc5bc66d302fc0280. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/GB3ZT2434016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcf0eef182ea27b680d0cdcc377de2d38ab373e4a1a92f672ec2e72c02fa9993. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/GB3ZT2434017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x080fc70618ec6f33c2ab4a5b8973757e40658176d1aa967adcdf61b94cd5938f. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GB3ZT2434019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d7d16fe8ea816aeb283a932dbf1bba2fbc997325988b1386c74e1c12b1f3cce. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/GB3ZT2434020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4d98cbb8a0f7781e224d8fc8d89b5f247839c51a4d3be2480c0741f88f5a767. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/GB3ZT2434021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68ab7315c6d26bf58786e0a99d3335bfb619be2f3bc22943f586a7c3182feb26. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/GB3ZT2434022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2769bae620c7972b0db86154d782233acd720ce5b165883fe1ec7bebbed8561. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/GB3ZT2434024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41d1968412a213e435b271f1fb0cebb89e40133e054bbe371a50179ca3feebf6. 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/QZMEN2219329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b40117a1eb427fdf7ca0b1a7be2e0e361daea3ba414919a03550f7a146c6d85. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCAIQ2411949.
Choral Music from Oxford with The Swingles
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36cabfff8e9f7489e2556b34199c8c528cfa8f8e30d4de3c9f5d797acb3f211a. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/GBN3Q2101886.