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 0xada17d78b9f699d2313c4232ff1109bdca5f238bf039419d694896ea8402e70f. 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/d3c71c76-dff7-4d4e-ae15-ed2083b772b2.json and https://artists.proofprofile.net/proofs/artist/d3c71c76-dff7-4d4e-ae15-ed2083b772b2.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 0x1170d09804096a1372b37cea857d64a3cb517dfcf5227cd68e058fec332d3c06. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/TCABZ1479289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f602e12b7f5b3f64f6dffb67e8e9c98a649c5f76e2b471d24c8ed04a68518b5. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/TCABZ1479385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d460c578ae78d9e34239e4554d441dc0ba1f929f8d60398042ea831aabf049e. 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/TCABZ1479387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe4c4f3e7b5cab090b50201042a8da2dbc0658897e78e503655f16349bafe5af. 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/TCACI1582871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4af1ebd4d51e9424ed29a3a0fe165af2e8538b4ab71bd5866cf01c641fbfbf30. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCACI1582877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d2c57d04aec6476b0049c7ea477b0d578d5be1e583271012c23117efb8735a0. 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/TCACI1582886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc37d630690a4ceab490f34d0d3b82b747f08985b23558f2208332e156388cb31. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/TCADN1854407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2320e22a0e8fbf95c0c1b127f2cc79e401c15567cb4bc278bfe765313d62436. 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/TCADN1854416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc99c85e784882f0f20331ea2031027e21bf69d6e925d7f36ce10d2c9e324f004. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/TCADN1854418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ac1e6a4bdc7353354a0501b46aa5c6a56d3e0fab8da67c97b0624c8dade319e. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/TCADN1854424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x018b079e01e5dce5dbeba8c3e7dead5b55b1f285e4d3b929f1dc891efa3e9dcf. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/TCAFM2133445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76fb92c66bfa0d80247e224431e0a597c3cc127b6606bb88bbdaa8a850a382c3. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/TCAFM2133466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x969abd5d1bb611eb1e9dbc8d92f823716c17d4a1f305c9ccbb024d6ced1beead. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/TCAFM2133472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7e8a3bab2f1ddbc5a8aae6bb75796ecc1ed71d3f0c833244d98dfe973ddd989. 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/TCAFM2133481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ae53719e6c8b47f88635b3c6fb8e94d40ab148e0838fb0f28f9ab67d17b1c45. 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/TCAFM2133494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38a52e172cd804c94cc0499468b1bd833cad9ee0bacd8994975cdc02ef5f49b2. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/TCAFM2133512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb422e61d5aa7c68c72d4b8bd144cf87777ac58c299adec31f1cd18e3879f5adf. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/TCAFM2133520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x007af150c38c6f7c7e9c2f28b22e9752e0edb2c29e07830fa0d7b34754dbcc97. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCAFM2133528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97ee39a1ab84ca12861954f76bd713fd44521e26cecccbc6a6217d2f7664c411. 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/US6QR2400150.