thumb|A slug on a wall in Kanagawa, Japan. Slug or land slug is a common name for any apparently shell-less terrestrial gastropod mollusc. The word slug is also often used as part of the common name
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 0x3f18fe7ebc216a4c5a6a3bf589b21ac1036cf88a570807c367d8452bb9062a80. 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/cade9a68-dd31-4c29-b1a5-4f2594cb3c03.json and https://artists.proofprofile.net/proofs/artist/cade9a68-dd31-4c29-b1a5-4f2594cb3c03.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 0x6121efc1485c12d36f5dd05b3e5db77ef1d1db59d74fb681d813d295864faab0. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/USANG2166369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b81a1673e44b68a31b68e517cd1f7f0952673c5fd01795a12ae01ee2b79b188. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/USANG2181245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36aec826789a0ad845aca15773b937c2771c4e6108c357f5d7dd4aa50128090. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/US3DF2223878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1c96107c4f32771e7480c141d503992156008793f144ed9cc455ab75ceb19ff. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:35:43Z), 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/USANG2448942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc752bfe58181841f7ca8df005fc7fa4e504e19245a45a1b815a8770a9f12ead0. 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/USANG2103249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d4bc7e48f8d011871ba6d7b66cab0540c2aeafad359821c49a47307d33c9db7. 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/USANG2411712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3607fcd62f7759df335db730b4dd68fe2dbc5d8b7de1b75a01a9918df16473ed. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USANG2411719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9aca1e66ce738050f5598e923bbb4cb0b6159b60096e463057d3e5b9728cf28. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/USANG2411726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x081236d34b531a9d3c211f1a48c915041764b171e128a37eff1d5ba3611309b2. 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/US3DF2232586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71ffdb36abe48c7f5648e32d13d682226518e4012c8a762955e065a9e465a422. 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/US3DF2232590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf18e60e91bee4302120bd59460f4a6d84fd599be0b9c924484e479d55d4c46b5. 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/US3DF2232601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99d3cce93a4def18a10c72136ec72b62381fb1edcf7fba158f9586711e289bd2. 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/US3DF2232603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd19b4049087efa15e22aebe9839edb7d2a627a659b7391f04e983807b3306b62. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM3DF2279239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a1327299d41a7ef47d58f9b4cbf957de503fb63e59a583cc6bdec4fbafebc45. 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/USANG2288690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71ffdb36abe48c7f5648e32d13d682226518e4012c8a762955e065a9e465a422. 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/US3DF2232590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe20c0c0bae0f7d8590319e1e0255925a097e27972fecfd1e7a09d099989ac040. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/USANG2204986.
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 0x95137cb7a94aab1d85deaceb6d8a93321a0d80d647687fe7a61506d32d03f6cd. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/USANG2411714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bddaa2ed737c8edd7b2d8246bbb8d325cb6a94a625025fbb99e2b56182025fd. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/USANG2411709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc4eb84c1647dd54b8b7a625b8b238b41be51d6058d64ace7614a69096f01cd1. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/US3DF2232604.