4Tet or 4 Tet can refer to: Kairos 4Tet, a British jazz quartet Four Tet, an English electronic musician
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9729940f76ce6daf7b64e70705b766bc8fa7f608f3a6de32825cad170cc6a32. 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/f253fb24-a6a9-4897-b215-986d4ad5189c.json and https://artists.proofprofile.net/proofs/artist/f253fb24-a6a9-4897-b215-986d4ad5189c.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8378023233473957803a0127c44cf2e7925b587b9d07ea70c6f657d6f176d15. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T19:01:05Z), 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/CZB270433101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ef448c3f4da307e47bbbe43f7134d87e157b48d7f89f783ba4d48f43272e0c. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/CZB270433102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71a74c2a3a9c8862e7f483957eda6a1b400eb63737d4edc9785f9840c305a652. 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/CZB270433103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8c5f6f2a1b91f6c1ba8eaeb002f39fc9b9e94ce7f7257d2b42e68ae27d7ad09. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:36:59Z), 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/CZB270433104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58391f951ff31b270c43e7a01ec2b25fc648c787363e122f0ab0a1296f5b79a1. 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/CZB270433106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c9f9a2297ce8445179b83ce5e1d7d4509533e6f1abc4f52e45fc9a1e7fe5847. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/CZB270433107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34e390e64e050d7c90eb5d652aa1aff1055ab86fd3e04c24c9f5908d29ea415f. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/CZB270433113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe387b3c55aad43e823fab629bf7ebfe058d1b0c1f881e93cc570d45c4f2df0c7. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T08:31:47Z), 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/CZB270559001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x124e4af60cf3aa7133cc6f1109b1b9341450df7405ea5bd23cffb45b7dc96ad4. 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/CZB270559002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c5b4e5e560df8ef36cf03e1f0b01accd02e5adb808cc6c6af8a8d0c29c95a39. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T10:29:45Z), 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/CZB270559005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b94feb6c4c4e4ff81f3310c0fca6ec94f2871a88f25a14670b550f2af5f82b3. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-22T00:46:00Z), 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/CZB270559008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16df01aabcb9916fe6e99c87df577c7a1543018fad574ca738bfe4543051e19f. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/CZB270559010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38f5646ce62952412177c2b17e12d44f95bbdfb2f4700343e23799b05b2f4279. 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/CZE510800801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3199e92567e32a0e9b6113a0d749007fe1cb67e11818d4dfb3e2445524fed5a2. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/CZE510800805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b98858b8b71696627ad0564aa0582096996dcba35f966e1481c6b02c9e7ac3. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T18:25:56Z), 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/CZE510800809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed37baa1b020f157b32d5eff25e1fc963a583dbbca3b434e6f7ac48344c4cc57. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/CZD712100164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4e7fdd0e9b5be657213998479851f1a792c121c3bd1feb250d4919fd665147d. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/CZD712100166.
Já půjdu tam a ty tam (Save Your Kisses For Me)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0e43d246326dd15a29f792bd9c52be51cf3abf83166bf99cc28b8f70306be79. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/CZD712100169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a763822215c5ed6bdf5390cb327ffd3f4bbfa147da1660ef8917df14b6f806f. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/CZD712100171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ae0813b052b4cdc1abb3bfdde36fc2d3426aaa1404d02c9008f4224e2ca615. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T22:43:42Z), 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/CZD712100172.