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 0x1861a4420e9f9024d09f362344285a95b57c95f2ac378f05641a7a86a5ee6708. 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/e03f6319-fe46-4888-b0c9-ad73d92b0c0f.json and https://artists.proofprofile.net/proofs/artist/e03f6319-fe46-4888-b0c9-ad73d92b0c0f.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 0x9c7ad021efde8cac2c6aa80335e2299a3d4037657984f72c1a71f5199add3506. 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/JPQ321500101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13cd1a04e70b4f1e909f5ad90b6260460324eb9f1c998494bed673ff98eddf08. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/JPQ321500099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2f22bee65634c75d358035b647db82f6016d06afe6c6da8c0fa27a95fb7e254. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/JPQ321500103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x456f9f202986efad40715a5846c3eaa91836e38027745ee87e313dc90a6fe454. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/JPQ321500091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x258cce42e86041299f8e5d459c36010d612816c27f3a5703adff35f504e1288d. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/JPQ321500093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbd0a2ad4b1390bd903a167168708a1b0caf6453eeef68e62fdd36a5ebd34870. 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/JPQ321500097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd763a46f9e5299503db5918c3235a1983b8f6030c42a9e8cdf7a3f51ff1bd6a8. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/JPQ321500098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x775d3bea5ee321b080040226819430fca84e9455ef3d6f9e196c4a32f249127c. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/JPQ321500095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d557607eb49810b7a1c3516021f9efd801f57ed75c79c700225c8b986221a71. 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/JPQ321500096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b5e93333701a363a88cc63e96c98c0e6e6d294a587b2381dd5eb2347b6fd9af. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/JPQ321600063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb3c0b8ee27d2c86cb1b27a81172a49d8c117fbf86e93a1fe5e9911d34f06699. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/JPQ321600074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9865053e8387146b405b970ef0944e5b8d4d06e24d796935284f9c6651679168. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/JPQ321600077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09525fc1a6ec3d624909da816a6323cd801ab3c8f22d79fd65feb5952c3f6f65. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/JPQ321600064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70f33b1bbb57314307bc4d6c8590ec225d2692bb110de0d6e55a969e1250991e. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/JPQ321600080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fe9b48846fd88241b7572bfe4a525d6e5ada976a90b600a356f1048ef36c1bd. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/JPQ321600071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24fc31605b1e9caa42d541373f62b72d4ed4c2e3e5bec6a721d3f39d058eb7d2. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/JPQ321600068.
ミュージカル『刀剣乱舞』 ～阿津賀志山異聞～
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fe9b48846fd88241b7572bfe4a525d6e5ada976a90b600a356f1048ef36c1bd. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/JPQ321600071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb3c0b8ee27d2c86cb1b27a81172a49d8c117fbf86e93a1fe5e9911d34f06699. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/JPQ321600074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42d6db594346e74c9250747c66caba7b95a0954db479d619d90b62234df2c582. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/JPQ321500102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d4b9757ca82a85a8d70c58ac714c874558cecb2a457f1dd986465e1fbcbcc10. 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/JPQ321600094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb143cf68eb12f1ad5cf6c26126af5237632298fd60d1c425c3a0f2782e8c1921. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/JPQ321500100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdebcf70ae21d157eff468dfab02d8ebbae1f6315e6742f4ee50f1b6bc1219ce2. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/JPQ321500094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7a10eb94c42bb4834448a204c5305e45d9a73a557cca6ff58643f9299be86df. 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/JPQ321600095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfef914e507c420749bfdca3a33e4a21924e1c81db8e31d50e36ff1070d79f62. 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/JPQ321600096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd763a46f9e5299503db5918c3235a1983b8f6030c42a9e8cdf7a3f51ff1bd6a8. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/JPQ321500098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2f22bee65634c75d358035b647db82f6016d06afe6c6da8c0fa27a95fb7e254. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/JPQ321500103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13cd1a04e70b4f1e909f5ad90b6260460324eb9f1c998494bed673ff98eddf08. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/JPQ321500099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbd0a2ad4b1390bd903a167168708a1b0caf6453eeef68e62fdd36a5ebd34870. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/JPQ321500097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcb732adaba217a266f324dc431440a46b529e11e6b555e29c452887e34b3776. 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/JPW641900158.
Danzen, kimi ni koishiteru! song by Ishikirimaru･Iwatooshi･Imanotsurugi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x448a1a4405dfbc22d0f13f8c27e748d7863dd43527cdf024cead21fe0fc7122a. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/JPW641900170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcb732adaba217a266f324dc431440a46b529e11e6b555e29c452887e34b3776. 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/JPW641900158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x591ddb4d595007673d15b44d7310abc0778cb9b40f67b47b4c9d82f65008a20a. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/JPW641900172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97dc5c3f5c0315855500759dd3fcfd6806cd6a524b2e64d7262949d779f80b44. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/JPW641900159.
Timeline song by Mikazuki Munechika･Kogitsunemaru
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd75d06f1f7546c298348a79df67dbc8b199eac774c3f96b829d18e20bcb1580. 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/JPW641900164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa251b81462ad8acfc2308cfc22e10f31ddca282606dc278d3da5e795134abec1. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/JPW641900168.