Sparta was a prominent city-state in Laconia in ancient Greece. In antiquity (pre-800 BCE), the state was known as Lacedaemon (), while "Sparta" referred to its capital, a group of villages in the val
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 0x0cf57ab25d80005e7c52cbfaae9e8b28e0c9e1a0b7c495aa47ca0eb152a6cbbf. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a34b1550-2e79-4d1f-ad8f-cd3ababa300e.json and https://artists.proofprofile.net/proofs/artist/a34b1550-2e79-4d1f-ad8f-cd3ababa300e.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 0xc736d9fc70baf07d1a91cbf305e046e3fe192b42800ac7f859f6d670d7dba0e7. 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/TCJPI1976004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f6f34359b467f8c3819567f0a1917a7291bd9fe3616f764bb70b8e117c2a3e. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T09:27:38Z), 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/TCJPJ1922516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x665392ed35911acf86272816ca94c8b445cdac9646f05cb179d245cfcad02646. 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/TCJPJ1922519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4232f18b164560f68be18eabf959327fed5d277bc3689868df794136370c330d. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCJPJ1922522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd0f4e1fc8327aac3d2697d79331327d4cfb997b7cc9906236d9dad3cecaff2a. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-20T12:17:26Z), 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/TCJPL2003068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x804a803727b83abc2c1183fb6c53fafb2657da0051215d46f2206ba1b4d60d83. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/TCJPM2039349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfda35c43a1738c19bcd3bbe659a9dabed380daef133aefe52206c50b0e27a6b. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/TCJPM2039364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f2be682745ee1ea5afe4a4844f46e5cf0fcf0c5715aacc0eb06509d989c317a. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/TCJPM2039542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b8b46b93aaa5685d131921c447e6a6744e24b37503043d4e65b68e8bb71de4. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T23:21:02Z), 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/TCJPM2039547.
Nostalgia (feat. GO a.k.a. Otokozawamajyutsu)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8327cba914a97286e61d7fa02cd93aaf8b324b84941968bab855c193399dcc24. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/TCJPO2189330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1ecbba0f6dca0464cb761366989145b2d00ce5c4e8a44411c8331731ed64cf3. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/TCJPO2189333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f651f043901e4696bb5506b7dba853ae0be17be0cfe1cd0ce126a07dc6f18e. 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/TCJPO2153424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ff7be6a3c281b2155e94a96763be7120fa848e096e4594041de01fef2cd2fb. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T23:48:57Z), 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/TCJPO2170368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc605fce4bcf6f5238542ebf553153b3b945ca8c120c6b2ea069de9a9ad225568. 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/TCJPO2189552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2252958d03189f064a52af49bd66847441e03cb1adcd896b99a386b023563d59. Chain 2 (Bitcoin): anchored in block 957775 (2026-07-13T00:04:23Z), 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/TCJPS2266050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2252958d03189f064a52af49bd66847441e03cb1adcd896b99a386b023563d59. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/TCJPS2266050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7d55dfb563521ecbd404b59081245eb0439e1ff1096194d31c2d640881d28fb. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/TCJPU2383373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe7bf56a32f755aabe632a8c043fcd0e958c4f1aeed7a5b34c717432a0d433f4. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:35:25Z), 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/TCJPW2385174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed881bf2894a5e249817ce7a0b5c3fe09658ae8b5179abe748900db4675bd4a4. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T11:27:47Z), 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/TCJPW2385166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe23df88ac96dacc9f9dcd13b860eb190ca4a1bbbeaeda6783439cbe8c047b4bc. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T23:23:24Z), 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/TCJPW2385168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21cc46e9d004367171141804784d344cab69c0a876c57fa1e3c4e684db189be0. 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/TCJPW2385169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b235f45410877909d603d1bfe6c83e087d4ccd5b2ad4b7af7838f6e586060fc. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T19:43:53Z), 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/TCJPW2385175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05e38c97fe9d9a0f7b5070aef44cd0b555642ea2f923edeab307bf9b5fb635a1. Chain 2 (Bitcoin): anchored in block 957852 (2026-07-13T11:25:45Z), 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/TCJPB2414448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49eda051ddabbef9ac61d3dd7943070a6f29bffbc07858ded60407209fdecce6. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T04:33:04Z), 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/TCJPB2442509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbff238e2da24c75fb495f9ffcd134dad3f17f3bfc426acbfed0f280651a29f49. 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/TCJPB2442515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc818e6ccc668c9c28d8213b1d49876d1ab6cb2a500bde6c772d8942dbb54485e. 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/TCJPB2442521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb3b71739ab687fdce5363a108269f48b9629e16764f46f9bc02b1b276ecf758. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/TCJPB2442526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafca0714172f26ac22b71b1d7f82a096c289c2654e56edd69f55e146f0db8ca9. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:34:52Z), 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/TCJPB2442529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7248c7025e63284acbbdca77e601978da7501ab5bfa2f17b3e07f7831a4ac99. 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/TCJPB2442532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9505029517f17dc9a34ffe712f1f55a64a6f688a714ca414d59737079c31ca1. 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/TCJPJ2552799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x223520f3d3b80dea107f08e661e3f6e0668480133ba5df502f0806c4af3ec9f3. 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/JPJ902104090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4172610f61b716349143f8914e8b37273f136da3da2c4877bac6a982aa3e26e6. 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/JPJ902301730.