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 0xdae40a0127dbf88a603b106cae9481f8a72aed5f668935899c6030d0cf9532f5. 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/ff28bff2-4696-46d3-883e-1db2a26ba0fd.json and https://artists.proofprofile.net/proofs/artist/ff28bff2-4696-46d3-883e-1db2a26ba0fd.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 0x26a0ee3ff408b145ad263457f1167286d84f6732aac487af297b1e726ab8158d. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/ZAG530900595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e020d573df7af734c79e825996ea1d86f5a3dc0dffac9d4ffe9f88271bedee0. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/ZAG530900598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffa0a656d8dd7f17ccb8de9955a6030935769601d800b33b9d5df6d767e9078c. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/ZAG530900600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa097b12a8ad27d72ca0c385c8e618e8be2083abacbc526edf1e55dd17f980303. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/ZAG530900601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aca3991eb5e63a0abfce3ae0d4eec919e3ab6ba7811b3ccd03b1d431b414cef. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/ZAG530900172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13888bbcdef915e1d04b035772ac722b69cc23647eeef9faf650362055ddcbe0. 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/ZAG530900174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae836c118aa3acf231cbb8b16ebb3e3e7f2dbde339ed5f416bf42ddb5645c70a. 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/ZAG530900175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa689e08200431d8704bc0b0159bab49359a500c971a6a16a4750cd7e71250b5a. 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/ZAG530900177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16c50e9dc2032be0f7303a98ed45bb740356b54ba7c9ce7ac94021b091a16cde. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/ZAQ652502128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f63268fdf0e32753a9b1925fd55914a2895d469cfdd1c600b7e9aef8fe8f8ae. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ZAQ652502129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6edf1c3a2f6979a887063241d0d7df84f42a15ce4478d0bf4f11cbbfac7730fa. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ZAQ652502130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe01a9e9462369d67e9cb3240dcecb874b18a4ad2c374f92c2bc315243b38b040. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/ZAQ652502131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x582412a4dc86de158b9dfa59161ee4b492fbeab335df6c06f9b340ae77e0d3ea. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/ZAQ652502132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04287092bc56606c580e1ba5f900d32185edf4bbfabe7583ef3e8c0cfa8c5ab5. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/ZAQ652502133.