Oldcodex (stylized as OLDCODEX) was a Japanese rock band from Tokyo, Japan, formed in 2009. They performed the opening themes for the anime series Free!, Servamp and God Eater and the ending themes fo
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 0x56bc873fb81b597f5f1d6c5e6d70366e919b64cc9b3905e25a2ffd9832010afa. 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/690d71a4-7048-4c08-a830-836d06ab65fb.json and https://artists.proofprofile.net/proofs/artist/690d71a4-7048-4c08-a830-836d06ab65fb.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 0x0051fa03f4434586145ea474d51445722d516c42ff6e1939815e2d07a74343bd. 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/JPI100902374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x991fbaa82f1f310180f150c8e96d356a5c0976f2c94e6f35a3ba88af5d8ad919. 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/JPI101201371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73665e333eecbc504d5b0305382fa7cae78ef09e68a486a86be4660dbe55f27a. 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/JPI101300800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d3d5c0091986188209606457bee82e266f8631b12fe09a32c4c22771f3954d1. 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/JPI101401435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6876895593a7c52da8aded8c4baf5d5ff944ad5fa8afcd7077ce13a1e2eaf7f6. 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/JPI101300799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6876895593a7c52da8aded8c4baf5d5ff944ad5fa8afcd7077ce13a1e2eaf7f6. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/JPI101300799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d144c830f979a6ff51fea7d1c3853bcc54767b43f792433bbd00418ff1ecdc. 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/JPI101502071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15a2c5bd4e443dc86fb4abb7b4d89b2ba34d88767018a7370bd48c56af365857. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/JPI101602206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15a2c5bd4e443dc86fb4abb7b4d89b2ba34d88767018a7370bd48c56af365857. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/JPI101602206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf04191be920dedb1bf1319ddb375ae96df822322fda415c23d5acb1a9d0d5b07. 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/JPI101602204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4377b3da1f61ea268e443cb85d94d57a41eccaaade50a78cd183ee64d7189006. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/JPI101601397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf04191be920dedb1bf1319ddb375ae96df822322fda415c23d5acb1a9d0d5b07. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/JPI101602204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de471bfce23fb666955d40daccac4a47481793498d640b6fd7badb60325e50f. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/JPI101801947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbec26791a927798bae854b4603c6b3bc6faf4af7964de84e5a7105dc1e987dbd. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/JPI101901171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbec26791a927798bae854b4603c6b3bc6faf4af7964de84e5a7105dc1e987dbd. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/JPI101901171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45724d9c7fa1ff3965f6c73f32e35336ec97b58e42933478f6ca61f3d284f64f. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/JPI101800064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x612a8ad846db0c9c4f0c6b9ef5691fec9852dcdc86461553ed307d35e530899a. 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/JPI101901767.
TVアニメ『Free!-Eternal Summer-』オリジナルサウンドトラック「Clear Blue Notes」
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x253d30dbf966124052f24a6483b3e433ce6fda4fc274dae55083da91f390077b. 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/JPI101401979.
TVアニメ『Free!-Dive to the Future-』オリジナルサウンドトラック「Deep Blue Harmony」
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe854b227ca148a23280f2a581b4b45aa96e822a884bda68b310a1c9c13ea88fe. 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/JPI101801708.