Cass may refer to: People and fictional characters Cass (surname), a list of people Cass (given name), a list of people and fictional characters Big Cass, ring name of wrestler William Morrissey
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 0xf13d91744acb818aa354f99352b6a16e921b96a51eda53e836b82f31a7cf16d6. Chain 2 (Bitcoin): anchored in block 953730 (2026-06-15T02:47:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9357fcee-5f9b-433a-a2d5-1fd2b076b9cf.json and https://artists.proofprofile.net/proofs/artist/9357fcee-5f9b-433a-a2d5-1fd2b076b9cf.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 0x4eee26fad091e8bcc669b26ac47b9a337ee8e36eb479fd747af3729649a56152. 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/QZES52052873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x074d13c30b17eaae87a37f83d86c9163e041b12ecf12469ec9d459bcc29ec151. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZES52052876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5342dcfd593cf12847b95bab6bf9b4360a45e750e5a5281a56cf9d4cfbc610e. 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/QZES52052879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39398c967060f96a000e17e697f3be92ee0d1e06acd20ffc0ea255740f75cf0. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZHNA2599290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1f23db44a6d5d7f5257161074a86a79957d04f4a42dbfcbcebc88ec59672487. 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/QZHNA2599291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x691f26acbabc3d9228ef9b519353f283ba708a9abbf9cad9febdbb16b4967551. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZHNA2599292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe13202632af568756cf0be70f0864c36885c017a6d9ffdf2cc88b1c8dbd40616. 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/QZHNA2599293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe914ac600d140edf6a3e991708f83130dc38aebbca4bf4bc417dc8b3682d4f31. 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/QZHNA2599294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd946ecf2280d21feb7370e7b3a03947934c0af5e54fc4e2e9ea1069d8783fb42. 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/QZHNA2599295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb02b0ed73e270ac9d7e4f80e4ec09ae6aea78036717951f56408182f4a9c3c06. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/QZHN82580441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x092d405e2c61ba8e1997cc62cd086326d82f2d48882f960c9bd2c981202f4ce6. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QZHNA2599299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b3b1952f3d85e31a5590d4f7161ca07d9ab9a8c99ff6963db4b04f2ab6464b. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QZHNA2599300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c2867652df4340d95909ff3c8cbe4e709e5a4a68bbe10353b72ad34e22103b6. 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/QZES72079289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36d85acb23ba3efe345dc71ed31bc52c3c0cd3fe1820f9162218df962c4e85c2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZW9M2268285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x743ec8c8377b843dc302f724aef8c2c573c496424100cb5b8f4ce4bd2caf05f2. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/SE6XW2406295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf77f3b2a84f101b3f189ce851a3d50681fd8bfc61d80b6f275415b5fa42e02bb. Chain 2 (Bitcoin): anchored in block 957210 (2026-07-08T18:28:05Z), 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/GBMJG2401060.