thumb|start=8|thumbtime=63|Ukulele made by Jonah Kumalae The ukulele ( ; ), also called a uke (informally), is a member of the lute (ancient guitar) family of instruments. The ukulele is of Portugues
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 0xe58b28af459017ab870981339c440108cf9428d2d87252d19b4ce1e57cf582c5. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d332d3ad-e31f-4a1a-bc7a-7ab32cdc8855.json and https://artists.proofprofile.net/proofs/artist/d332d3ad-e31f-4a1a-bc7a-7ab32cdc8855.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 0x47ec52226cc75532ccbe616a2fc6e011db8eb6312489615607a184d8a0ea18a5. 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/ITUC40000031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485e868f5ecba378e7365d49abb87345d79a3b9f425426f4ccc145e0a78f7945. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/ITUC40000034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47ec52226cc75532ccbe616a2fc6e011db8eb6312489615607a184d8a0ea18a5. 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/ITUC40000031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd90f6f7d96d3eb0150e1d7f3a2400850c876de441848c67021ea4f0056b4d26e. 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/ITUC40000042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd50bc3c709cf529fb3a6671171f77d7cf03aa0346b3e5ebeaef857f74c56b57c. 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/ITUC40000041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485e868f5ecba378e7365d49abb87345d79a3b9f425426f4ccc145e0a78f7945. 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/ITUC40000034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf903a51b142d18b1c42b12a2e6154908a1846c78ef7ce0590b9bca1ba9e89ca. 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/ITUC40000043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5eedfc89e9ff114a339305691eb82ee7d38b220ffe67e0c4dbf0c778d1dd347. 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/ITUC40000044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dd6aae15d397bd726d18572f592d4564492466c3e7cd3dbac0a7a883692d15c. 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/ITUC40000057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x558dde54368736184bb5110127ec358937bc8fd817aec289953fd12380da2c11. 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/ITUC40000058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x923c1a965cf9bbc445b37e73bc686a434d7ff1637d2b777532b68dce8fd4f0e6. 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/ITUC40000054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37abd080a5faadcbe1e965d338ebc44de21f3a73ad5e46ba82f661ef1f23c066. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T08:27:53Z), 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/ITUC40000059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c40adf68eb605d9a180488060e63f66264597c5654bfd22152bef97838a0d2e. 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/ITUC40000055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b66380a60498d2773636ad11eca815e1f819547c8ad8d09cae51206f921827c. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/ITUC40000060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x347c8aac2ef6fb45fdf17ccffff7f531340b15eb6e1e54865a171ebf1ccf3035. 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/ITUC40000061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99455b30e6c4117ca1730e19caa19988bec10fc21d943744b9f32ceac54fedf9. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/ITUC40000062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3fa90dc75c5eadb8b93c4fae61d456688fa4445e7532d05b6c1e977573ca458. 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/ITUC40000063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3fa90dc75c5eadb8b93c4fae61d456688fa4445e7532d05b6c1e977573ca458. 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/ITUC40000063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbef085eaf4a6e213d18cfaf733232a7811b1c709e2d43e983a484b2f6bf69011. Chain 2 (Bitcoin): anchored in block 957778 (2026-07-13T00:08:48Z), 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/ITUC40000071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf88865e0cd634bc48f602a6b660e3623e0e6dee2b2f675e3072b14edc62bf756. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/ITUC40000064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4f72ac572e5890913294355a9d0aa398ecab39b9840a8df47294d701303599. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/ITUC40000065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36dd527698b43a56a3139d333963813f71618b0cf1e2ae99bdf8b2826544f5f0. 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/ITUC40000073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65d0efb5d6c3dbfe66318499dbfb5d2b46ad5d5d7f69fb9de67bbaa52388175b. 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/ITUC40000074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd97202e5ae04576db0a57d426b5beae0a9eddb7e2c0d613b2d02155752da8eb1. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/ITI342200018.