Heft or HEFT may refer to: Heart of England NHS Foundation Trust, a health service body in England Heterogeneous Earliest Finish Time, a scheduling algorithm High-Energy Focusing Telescope, an experi
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 0x53b90b270e7126f9032e31f3267de1a16cd3ba29b1fbfb9909e6009bb1c9b3d2. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/965a9bad-4c62-47f6-bf43-9f316a7fb167.json and https://artists.proofprofile.net/proofs/artist/965a9bad-4c62-47f6-bf43-9f316a7fb167.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 0x40a0e26af00edd69ddbfa031c577eb7256d4f6e754378a469fb1d6dd2bc4b3ab. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/GB8KE2409330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76dced00944f7d42a4898c9f5ee415ae5e9802c7449e1a6622aeb7b9ca6bbebd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GB8KE2409331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf65151e18fb196518add931e7c4135d13c879287a318c96c9c8ef881464dd4c0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GB8KE2409332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6da8d3d9eb99dca08c0cb9f4b000c10700d50f2ec95fbc4c8de370cea474b2e6. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GB8KE2409333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d6fea5c656277d409be7381f3a58415145a1d37db93ce7edc96da1dda322bab. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/FR2X42407042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x206b36ffd16ec40c5d857624be0c5e28f071a7f44f44805300a1c39825299f4d. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/FR2X42407043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x638cee835e8df9452684a7915d33402a0eb73c199edf1adf02903cae679ca778. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/FR2X42407044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60335fe08f9dbb8a6cb5671928c5e9ff8dd90f5f3a6309e911e68005daf02136. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/FR2X42407045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ec93f8ced873429d6e0a4553cf571d77fc6e498f1a1a56bb0ff4ca28906b0fc. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/GB8KE2327965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85bc40f58c47bd18d39957cbc5b4df5f2cd3206c74247ea84f0d6bb40ddf9224. 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/GB8KE2327967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ed2e21b2b0a3a1c528dfd1ce5965b4ff3a42eb43bbb2e038cce2f2c0b2963c1. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/GB8KE2324212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b45a83131a753106314c17ec740f43c9c9f18c3473257ab7e584aa7c05904d9. 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/GB8KE2319968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2386674dee756c1717b0be7d90cd0ac8c0b4bd1ce756b7ee0a0d43f8f7942533. 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/GB8KE2319969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa60652766d473bfe04d0ca20f05d1481736eeb521ad672ce1e28183204b4a011. 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/GB8KE2319970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ab076e435a4058098be29b6f4081ec77330183c618c6f870105e999c117c78. 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/GB8KE2319971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bac431cc15aa2196d5360bbe663715806127be322055a0305c43d6a626f848b. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/NLCK42236629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5b7a568a16ca51942e15dd63473cc3ad4ba1cf516892b6f5188b1d6865142e2. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLCK42236630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba6ad3181e98527f8e989e7aeec1bb7b1d9761c210759f3716f15858d94ad1a. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/BC5A72300024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7c3cbc1930436da13c3a4b51ba7c135b36ffdbb7c7281b5c89dc18b9fbc0b39. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/BC5A72300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99edc569a4ed8e7017f4a528c86d5769c6ded7af5040a10133ec0b19fe6fb840. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/CA5KR2329220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x993a5df6a7ed8ad1bd0bed5522a9341ee5006c43d78eda46eec3945d49ac0550. 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/CA5KR2329221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf8e37a902360081aed967a25244cedc97543891bf790cfaf5655766062e3c7e. 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/GB8KE2303548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6114bdbdd993b5da45973af670b582723d32f4c39dfa7cd849e11b52b739427f. 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/FRX452261492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b6e8a4fbc3229493444ef03665059ed04fa6afb50fa019cea1a6567dffed5a2. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/CA5KR2266889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46340df8349110c59a83bb1d02a184048e763522e3f6a027d17959acb7282e88. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CA5KR2266890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x409866e14e5835f97143357c02a373d4d7942cb186ffa7cc2bbcbf5c4630206b. 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/NLCK42213508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40693cde7d3ebd426cdf00d1439e00f01f43f7e7225a7afaf5bdc88b150a106c. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/NLCK42213509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5391f6ac5924a4aebcd970f0255ab9f1ad5a180034d82700364c1f14866f87d. 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/GB8KE2200044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c3e4d32d01236e14fcdb05b2274141e88a3cad1d7743d12fbc91f02c2ff287d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GB8KE2200047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a55d1afacecca2cd18c8eba8194f9cb050369648ac2fc86e43b8b7e3b4c5b8e. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/FRX762149164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x363587fe1ad96d3d17a392e309453479461de86680798c9f28061bad2dd6ee02. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/FRX762149165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcf8d7e83ea99cad8db20469eab2345691c993d83405f1ac007aac5e3c402d23. Chain 2 (Bitcoin): anchored in block 960305 (2026-07-30T20:14:59Z), 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/FRX762149166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ed06fce0713d49f43743c947d91da8fa1d8ef8fbbd318509fc864c2784e7bcc. 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/FR59R2122946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d2c60fce13b973286ff0c48d01bef8090fb7ec3a16f1c3f4d8f8756e6f1352a. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/FR59R2122947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf56b33f437714e9314baf5408c1ac41b6100a4a08c51a9233b6f5aa476e68bf6. 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/FR59R2122948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4162ccef4d695a7a1e0afd83965bb7c62efbae0057891b709e5d0312db0e0c30. 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/GB8KE2152566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdcf75883091a3bc569a0794480cab9404916d17369b64966f9bcc3d3df481e0. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DGA062034827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1687abc45c6c17cede3677eed41dfc6c9a176a28e12a70f42f1fe6291c3ce37f. 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/DGA062034828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9677599480fba47d039234781609abdaaf00739eec6c89ccb67f4f84363c9e48. 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/FR59R1867870.