thumb|The Slingers performing at Seasonal Fruits Festival in Brisbane, September 2023 The Slingers are an Australian alt-country group from Melbourne. They released their debut studio album Sentiment
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 0x0648454f7e294cf16e840fd9295c7a1d916621d7c9bb9cbd0463f99236fa0a82. 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/e821e83f-16cc-4be1-8295-8190de94d982.json and https://artists.proofprofile.net/proofs/artist/e821e83f-16cc-4be1-8295-8190de94d982.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 0x4d0cd2e4f0dbcbaebd4eb493088078b196cc2411d98ff2214067a65bb48d1fe2. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/AUBEC1841293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c0e9b4807fa318ad0bcdf9bf69d6740fbd3023a435a649318d2620aa3011684. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), 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/AUBEC1900701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13df14d307ff67ffeb8b76df15293f83ebaaa381fede0c015ab68a80adc93ddd. 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/AUBEC1922602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9487d7331c89115a37e09f9cf5167ac6ccb679e17ce5fc2776fd9d5b10d00693. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/AUBEC2159820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab84c54c823dede265071fddcf91dc9d4a1d4ff91ab0e243acd2976ae50485ab. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/AUBEC1822269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46dc40d6c0ea9f36512acef47895f2bbb6385da248dbcb9d08771a1072fbfd9f. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/AUBEC1822270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef2bbf8adb5983ea9992723075573cc6b65d03c71067cac004fd02199ca6565d. 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/AUBEC2011767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc77765383cb908491cc83832461e1a4a59925899266258965b858e1fa0624af. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/AUBEC2031055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6020fd3bb3fe8a16bcd89654a4ce07d6bcc8a4824eebeed3155e417fdf5f3e98. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/AUBEC2040587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bd2066a0eda5f3c84b2360a8a9941b6a7573aee5e7cdb9f0a008d22b3a7ae73. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/AUTZK2200024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4ba2aedc8b971860a04d27908bc5897f8390144c4265895d261a261f00f826a. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/AUTZK2200025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc01e16dd624f6e6c97cfefd71d71b659660dbdfc534c6c2ae8eeb330b55f4c19. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/AUTZK2200027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dab13a9d45afbec18a23020677ea3153c0329f98b79281f7b730d5eb520e335. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/AUTZK2200030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6abd7aee8ae5730519b3f5cbb7246f7f8989d83a22859848423eab42e96f99af. 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/AUTZK2200026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55104b4a29ddb3a588aa1320336e79ba683fe274dbe0d16634bc1b96495970a1. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/AUTZK2200032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0fd466f4b79093a20cd8bd9644e610817a900fd20aa16e7208ac98ce9ccb93e. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QMDA72562531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf19e56fc7630c311c97e134026437ec3f20c4a6cbc644372f6e33b4971b31a53. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/AUTZK2200008.