4D or 4-D primarily refers to: 4-dimensional spacetime: three-dimensional space of length, width, and height, plus time Four-dimensional space It may also refer to: Computers and photography 4D
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 0x0e45665e9ba2578125fd4da234d4f68e9815bc6c4854e634f69ef4d70a867d6a. 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/59d40748-90d3-4d30-ae1a-58c49bb4de97.json and https://artists.proofprofile.net/proofs/artist/59d40748-90d3-4d30-ae1a-58c49bb4de97.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 0xf98335c408af6f9ecca2cdcf21883947dd8df4dfa8b7fd79badbc316e9f62b3a. 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/CNC072201550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47d32292086c55dda3786735cad654356e95f883b774e38061a68cf4566fa6dd. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CNC072201554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2f8a1596e16c9966e3fa1293357a1b5048328168c6f7d0642c893d6204772d3. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CNC072201555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97abc123eedca994d7185cfadf3632802b4386391ca4be04070ad372a6172b43. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CNC072201551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb7db3e3cacd8f60e329b3429e72bdcdcf8e9a51bc0f1128a7deb3094d9a1c10. 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/CNC072201556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08aff30aad9f9aa20f9501aae65babce8d498bca0e2b213bc8e82598a0aedf5f. 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/CNC072201552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3835405a90031b22883534dd186a95d04e262808235db523b827e306e0071f26. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/CNC072201553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc90535ae9df904c02fd1cfe81e71622f95dfe8d02ffa682ac3b085f8360ad48a. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/CNC072201549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2f8878b21441e80e149ee01bc7168ca24cf4cdeac9f4204706ed3c513e42038. 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/CNZ682100163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f4907a7312409771f2576c7b50d5d843accaeb6947ec282af5370ab77559a2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FRX282119264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88ab36253479c9d17c3670c78ee5eb704b37f2c7981b2c877a05d2863402a943. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FRX282119266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x629fb2b96f5856f849270393ed93582b372fa0614469a2a4d51a9e4a34e7301c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FR10S2120456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9223d4dd88f14cfe573591f50cd931ff0bec69c5e36803dd0c12bdcfe3a1d01. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FR10S2120457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16b05dfae8f255da0155e4d8f305e909d63411770c1946b41513a2dad464e0ba. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FR10S2120458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8ed2029ceb877839beedfbd648e7eee323c697ba95db52ff0fb2c54642cda9c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR10S2120459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf60d98b2ba7fb6c7f6d543bbf6d9618bd4bf697c2c3e8690644925521188d1f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR10S2120460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71497dac9ea4c8d7501bd68197d223f26e46a18f64dd9274bc0d55eada06c6b4. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FR10S2120461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49caa03b1c0f44b480d17c0f48ba781b8f52cf5931e9ddb680f85064c8325548. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FR10S2120462.