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 0xc6dec7d8929f62c017551a5e9765355d6b55fa1d505ff0d1d82d79fc611dabbb. 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/c853b464-aa41-4973-9a39-ad5a81968b29.json and https://artists.proofprofile.net/proofs/artist/c853b464-aa41-4973-9a39-ad5a81968b29.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 0xd11fbf8852a6e608cfb582a2a55a87696abcbfde0f3009b69d67fb63ab76e134. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZES82102739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a5446aa5b1f138c6c48410cfdbfcc8572c642153e30ea994fe4d5051eb3fcec. 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/QZES82102740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd588a050eb13ea8992fdcaa0568941e67c455d27b4b130de2bdc11265cad5f5b. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZES82102748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fb01633d6ff150da508c19fbed1da65e65d97ca69246ed6fc25be2dc9bb4e43. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZK6Q2155596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37c23ffc52863a51dc487fef16c1ead31f13d71ae58cf7dd90f00b0f51ee9a8f. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:25:36Z), 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/QZK6Q2155603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf100542b99897c283f213fc4bb1b788c6de72a4e49e9637f5b7b53b37668adcf. 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/QZK6Q2155605.
Shinzou wo Sasageyo from Attack on Titan
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73895a813a6a5a1026f3155b3d92c22bfc68c394f175157052dcf0f0c4fe68ab. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T23:23:15Z), 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/QZK6Q2155607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x755aa15e0e735733243de7975a4c76a4154597ff8c46e4b0e08634c4526bc292. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZFYZ2248841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20f1a4a3e89a8b213b6221eeac20361aa43b7fd5fde95fd174a51c734be23790. 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/QZHN42240725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf301a51c75798ae524176d5444e2a4b065be45c393d755de25d06f07fc0bc088. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T12:55:24Z), 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/QZHN42240728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef7c60a7e24221673e2e7bf09987674f5be5dc625c839d63803172d76a1c3e35. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZFYZ2378876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x428e134d6c38411d9a79a65e3e3764309ba19daf1cd2102738e363e1f7eceb15. 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/QZFYZ2378877.
A Cruel Angel's Thesis from Neon Genesis Evangelion
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d3c6d838524d2c1f94d8500b97e0b709e1cd1b1dfae9b6a537a0e85c337df52. 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/QZFYZ2378879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb27cdae920c863d00a7a8a907e51d717ce69562ca066498fb18fb9e8f1be7bb0. 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/QZPJ32284132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeea683eab5088b72b651499e744813197ea232d8753d533c53c35228c21cc9e. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZPJ32284136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb1d253287e957f560b8f6150a7b7208d9d38bbc6483d8a0a80dd75aed4883ad. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:10:45Z), 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/QZPJ32284139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eb9024d895b1057ebb67fb7d28e3163e8aac5077645f180ac3e16a34b40b14a. 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/QZPJ32327441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a32b30df142c5f743a8767b1b0b692758eefc93705590a6897734f98080d62f. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZPJ32327444.