thumb|right|The surface of an apple has various perceptible characteristics, such as curvature, smoothness, texture, color, and shininess; observing these characteristics by sight or touch allows the
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 0x42c52d5322e9f16641e80aafdd89b40650c2de200cc9fbebb4eb2aa64082c67c. 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/e51b6ca4-65be-46c1-a99a-de10eb55719b.json and https://artists.proofprofile.net/proofs/artist/e51b6ca4-65be-46c1-a99a-de10eb55719b.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 0xefd720fbb4091d200b25e9f7fbb0a40e12c75a5436769f429a99facba4ff5b04. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T19:35:04Z), 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/USSM19913069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb2bdaf165c26cd043f74f44c02f460e52809e95e6ec341d9ef99001d929624f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USSM19913071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6793ff4b4962654da878c0c37e81eb8a1d37a642d1e94f9d2e4f598792631bc0. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USSM19913072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8061480637a4935ec5f2cbf56e66171112c1fad3006236c4d86b79c389afea7. 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/USSM19913075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa913f355cd6b69ca51ab12186c44829ad7aad38ae238b4f93b6622890f66eb24. 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/USSM18600952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf0d593d200d2155dbc16d0c5e4a9c9c727e2cbfbbea0e3bdefaa75c27fa343b. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/USSM18600954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e1b5f2ddf5c1ccc85f9ea8c15191f7e1bc3cf0b907bc8d40dfe9e8e2541102d. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/USSM10105139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b34f463853545443af15f7d5cf4f7c0415970bb931e7a5da3e2898728244471. 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/USSM10105135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8678b9707fb53b14975b9f5745112a670fc7183fb37ccb9d340b56a6059b8fb. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-27T13:49:03Z), 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/USSM18800966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7af3e152fee82a26c29fbe351e24cefe84549046ad3d0f805af1650320d246d. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/USSM18800965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb455e654394c5210b6413111a8bab7e98003b1761a88da112d531499769950af. 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/USSM12000379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd6231f450c52bca127d0b0932e5bd0db65a4759579a3386a4c99e8d110d1f3f. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/USSM12000382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dda2476103d6dc83b2d27f1e994a490ea656d4c106becfcf7140e5239dc2dcd. 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/USSM10026258.
The Best Of Surface...A Nice Time 4 Lovin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6bb2db54aaa38caacf56a5e89f04d20da6ef0f056d0f8f969cea6d31c2e236c. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:50:46Z), 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/USSM10026259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21664135cf0444458787ef145150312c6f9c401bf39cd8175531b7576ff5cdf8. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/USSM10026257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x174722c387b025060f216b3b1b54a4de8ff9cf2167edcbd06e24d6b56c0736ca. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/USSM10105136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x174722c387b025060f216b3b1b54a4de8ff9cf2167edcbd06e24d6b56c0736ca. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/USSM10105136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x736185fbd0afc78b42906574bcda0137f410533f76107bda56f971a6e30c2b89. 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/GX9RC2546076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac7cdae6659b19935f9dd75c6d8648d02b9af5aef45423535d04b449e52ea7fa. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USSM18800614.