Ico (stylized in all caps) is a 2001 action-adventure video game developed and published by Sony Computer Entertainment for the PlayStation 2. It was designed and directed by Fumito Ueda, who wanted t
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 0x94d454d5c13803b4d578a1f5b878063de734307c5d8b448efffdbcf2beabeec9. 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/c620ef27-4bd3-4a0d-a5d6-7a99deea467e.json and https://artists.proofprofile.net/proofs/artist/c620ef27-4bd3-4a0d-a5d6-7a99deea467e.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 0x84025ee8d41f91ffc3f0ea81dfd87c6f2037e37a9706b436e7045070da0808cc. 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/JP92A2100948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x860e34ae904970d2e38d144c83a8e70fa90661f207a56c03fd125c5e2f5cec7c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/JP92A2100949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4018d8b529645e1c818840872c30ca1a59074d97d57ea47dd7eafe62970de58. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/JP92A2100950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e3326a0d9608f07be38d06d4f7dfbfff41d03b235cb8e0cdd3810b179f9eda0. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/JP92A2100951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2475f35a9f2d96f2f5deabbe08cee966f58903394bb758558f2de2bfdb83828d. Chain 2 (Bitcoin): anchored in block 958882 (2026-07-20T12:45:27Z), 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/JP92A2100952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf68511cc5281828642ef0fc814553dbf4f2736cb4afeb2c4cea5bf5b1abe1e74. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/JP92A2103766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ad0a286f154daf3a034fced3a0bf2e68377a66d2320457d959232e00ff676c1. 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/JP92A2201141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd251bee1e9ecd54ad4e99f51a8b6d37e5f4d12d8c8ee3523002edd68fcf7026e. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/JP92A2209557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c91ef128b38f2e19af75f350489dccdfba12897dc4bf83578e2d49f09c15eca. Chain 2 (Bitcoin): anchored in block 958613 (2026-07-18T21:35:09Z), 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/JP92A2209558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba89d97f7f76db077435886405afcf9e778995fefcc83bb3e950e641ef60a5c2. 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/JP92A2209559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04e85922f0f5ff7b46fbf8d99189aa7f30d80ccea787c9bfcfd8b3357a3defdd. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/JP92A2209560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbea0e1d8cca1c88c1ad7d72d384467182d74e4fd59b4ad0be4d684c576335c8. 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/JP92A2209561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10d1643aa8f9aa722badf5d4466268d290c3926fa4a1a8664f2f08393c6228db. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/JP92A2311441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db78b558924452f63d9a2663dcf4e6ad595b4adee6dbb2fd911d7471cc2c334. 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/JP92A2428632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2707b774c92cb19ff58df58e646dc551e0040540a3d448bfbb0682fb77d11e53. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/JP92A2434244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f054981056153cc85eb19ca12653faf461dcef40d7496fc6fbc1222a13375dc. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/JP92A2318896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd57b6250b4773a4a01807e7f6240f6b197c30fc3af66672d386a05b3e5573d2e. 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/JP92A2434246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc166719c6208df3aec0fe2460cedc7876cd0e9a25dcc7987f540c20be6fbe325. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/JP92A2434247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db78b558924452f63d9a2663dcf4e6ad595b4adee6dbb2fd911d7471cc2c334. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/JP92A2428632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x278ca372056cb189d490e87e7fdbcdf39fb072fd3085902f9e42347dcc19c656. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/JPF702500206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b0bce2804134d61bb7626531b477f62c326a4e81dd79e4278565df811243407. 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/JPF702500231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea3dc941c90057a64718140b180b67d385d6c8da63f15610e848d5247a1dbd3. 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/JPF702500256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x278ca372056cb189d490e87e7fdbcdf39fb072fd3085902f9e42347dcc19c656. 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/JPF702500206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b0bce2804134d61bb7626531b477f62c326a4e81dd79e4278565df811243407. 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/JPF702500231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35aaeb0e14bc5e306d8cad1849e4fa1850f76edca9793abcc0b5bf5fdb479079. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/JPF702500458.