A cloakroom, known as a coatroom and checkroom in North America, is a room for people to hang their coats, cloaks, canes, umbrellas, hats, or other outerwear when they enter a building. Cloakrooms are
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → block must exist at that height 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 0x1ed748bed4f1901ab76d3b83096f01c3be6c2676432af43e2be715bf4a7744a4. 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/a286de84-8a2c-4af1-8699-a833b9840892.json and https://artists.proofprofile.net/proofs/artist/a286de84-8a2c-4af1-8699-a833b9840892.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 → block OTSBitcoinBlock must exist at that height 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 0xdc150c4426fd72be5263d4440890d9d72a5133908694777a1da78c6e206b3e24. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/USQU71307601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd392b1eaa382472e1c1a37067bf37a5b9ad9cf82d28b6ff129cc379da10fcd06. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/USQU71307602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f774d3ab615c076b0120aee945e26b67aa6e323434c34388221d1bf976f5627. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/USQU71307603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94194b46e56d9fc63e55449eefedb0695b3cdec66e391c6e7a20d68ada8e1834. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/QMCE71300225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4624218fbffc658bfd4f03d81b9a5f212ecff5848ab6bcf04822ee3dfdd7902f. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/QMCE71300129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaab5ccd1af221304199108bac9b2be71d5b65485b3f1ed9da2daba1d76cd643b. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QMCE71300130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54793056751b6916a08882f08de8dac4c493345314c79d6afa7ee363b9f61549. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QMCE71300131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05666f859cfe3d6cc5f8b1013eb3f913c69d8b343b05a8091c77b5fb0f823c31. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QMCE71300132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06dc7a3f4bb35e05207bdbf37737e642f2db181008200090ca2b74df4bf478be. 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/QMCE71300133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b585c8ac2798af8bb8bdc5a8e9755d20b2f1592173652a3da8bacba71a57365. 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/QMCE71300134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dbc8f83e2e7002858a282da02814611a90f68503f789dd8ac6ef18ad583c257. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QMCE71300135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34b6d5408cb496e1c0f7dcb2f3e0d548f816f2e05d6f3f855a31fbf03bf22f67. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QMCE71300137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9182526be991a3c268009b65db0ab75b426808d349bd21503359809f54d26ab8. 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/QMCE71300138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad4e6adbe1510c611f61961b27b8cacb25951370ec6df83a4d315f4b90c8a78b. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/US2641735603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f5066c43a57938d38eb06fbd65416e2c4f6a93dd22bffeb4519c084a5bbc707. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/US2641735605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72ea1a1385735537a2a8bd3001eac247e96d0843015ff4e3e99f2e4107b1780. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/US2641735606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4e73f40820d58a5bf5ddd5a859c1bbee312eace4b8483340c8589d2895cdcfd. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/US2641735608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1afa7e02e25efee82a547433bbc1e50cfe4926a5ed19da8b416f6527f476dbb2. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-16T00:01:01Z), 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/US2641735609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfb21a77440c4ed1d66dcb1c5d648becad3f2ced0b0b20edb2e97b8e2d7d10d8. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/US2641735610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x012eea5f59e859f2e7f3dd0cfc23fe18d0dbd8bfcfadbca859403c5a8f4f00b2. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-20T00:10:46Z), 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/QM6N22436525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4d009f1740bb4052ecdf401bc85402630ba75b826c157181603664e79d3e58f. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QM6N22436527.