Capstan may refer to: Capstan (band), an American post-hardcore band Capstan (cigarette), a brand of British cigarette Capstan (nautical), a rotating machine used to control or apply force to another
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 0x89f725cb8292735be46068c2936238b305e3617131c6a49f52a14aba6d7fdba7. 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/6d469a19-8e72-4735-a6cd-fe8857a36f21.json and https://artists.proofprofile.net/proofs/artist/6d469a19-8e72-4735-a6cd-fe8857a36f21.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 0x19f9249c05cbd65060a46f0b8224470f19e520b1762f15ef2a85ce74575b4c1b. 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/TCACE1560161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2390c6b9d164060d8b6fb1dc8de0c4b8e8aea66e0341b6a8bbd4eb2f2461508. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/TCADK1756266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2bc9ad18903de5d0b1bcfb020feba2ab17b6fdf3e8fba4691b50aae1841fd3e. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/TCADK1756269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75cdf25b5d95eb6a590560cdadbdff57e673ce404ba41e64d31a554ba47931e3. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/TCADK1756270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe33545c6d997cb7bb508f2b06f35945ea747bc16230fdc286780546a982d4547. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/US5261923249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f17884f973ff71f65c64573d238f85acd1fdf93f7530a4895e58ff68833f4d8. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/US5261923256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd49a3a0e0aa72950607deafb1bf64426ccfc3ababca1e12c0397254fbf0184af. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/US5261923257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc19d778b5172fbdbd88ddc8be7f98c71234e7f959403c2075ace4a7b71547e3. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/US5261923259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a2e99c5be90d1111cc41e5ac0fbf0bac86e58f9aabceb3ca23fe840a264d961. 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/US5262023635.
blurred around the edges [Feat. Saxl Rose]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c6627846df9218e4d448c4317fbf60603c1b438cb60b32c435235849f9f48c1. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/US5262124096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb31af93c801c9af093243492634f639febe8daba21eeb80f33ea14a804a41dc7. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/US5262124100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd38baae3a8fa200e7f9662aefff8f172c78fd50bf510063d21400f5f08e933cb. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/US5262426363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5490ee4e8e19bfac97044e91db8d8263df0972b9a7d3658e8a7f0eda9444e301. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/US5262426364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97ec76d46c413e982008a315ecd93bf76ec045df5c27e9e9399966f9f177420a. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/US5262426366.