Katze may refer to the German word for "cat" Katze (village), a village in Burma
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 0xbaad738c221ba9a592d85498cd85835c3e6c20f3348755bc1fd8eb745610bdb0. 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/420c05ec-3719-4883-bc5c-ffd8b456d99a.json and https://artists.proofprofile.net/proofs/artist/420c05ec-3719-4883-bc5c-ffd8b456d99a.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 0x3f08cb0a4690eb4fff02ba82ab4a0189b4f4ea86f8b9b319481eb851e31dcc82. 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/JPTE08830930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fe2028f18d28fc181bf4547ee73e9f4d1718346c63541015ae0e3d6fa4ce3c0. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/JPTE08830970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5266530ad9bd65a996ed1dcdd719bae3cf493b4b8cc3fbeeb6e12fd033736dc. 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/JPTE08831020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47aaeb6c9f07d4c1689d9f1941b21c4ad06935cc3cd99077d4b1dd4344b31493. 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/JPTE08932220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d5ff61628b084e94272220637e60d83b985b57618d4159f0c60cd946693b8ec. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/JPTE08932240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e0697529b6d45b2999420fe3f8fef8c39bed62220fb134f6720968d6a282220. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/JPTE08932250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x291413880b082ad6eba01551cbab36ecc487bc145e06b43bde6038e5e4116be9. 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/JPTE08931960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xace72bf5b709674d83d9ff1f28c8121588df08c8c71429b0d049e12575047ac8. 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/JPTE09031160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa28fe92a2194b4b21bbca8a1698ecb18a72e67f67dc939aacdc34bbf2ee0e37. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/JPTE09031180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1ea33e2b7582f0461a15e480edfa4d3ac44ceba3096c50f4a47489d30db0dc4. 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/JPTE09031220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeb776e0526c4bd603ba5f4365770246605406837f2505957a79e71b03753fd2. 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/JPTE09031230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffd7b609245371f285347f87c21eaf12b10135a6fa3aa3153f70993822e11b2f. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/JPTE09031240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d75742ac244fe60955072e0213ecb89cd5a7170685358f24009dd44c7e1ef22. 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/JPTE09030010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec7cc43c1d6dbca2d7e816333c27a2958a61df71e5109e38375a28d4f3ee9c85. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/JPTE09030020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c6efd690cec0182487ed479cbc536e2674d0c750f6b19801a9cd2899b1a955a. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/JPTE09030050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65b777596c719e6f8ebdaac07bd967e01a556fe4daa2157fa84c31e86ee4467e. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/JPTE09030060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77544ce9f47b2029b20790cfa3ebc58faf586b13470ef97c20c79f5176d040c8. 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/JPTE09030090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eea9de96ecad970899253c83a89a2f3ddac8ad388f9f748e44a8d77319c89ea. 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/JPTE09030100.