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 0xebcf33e093f7ce17450dfbaecf20a8bab7f1e0b3c3e0c9083936f8558e48621b. 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/803983f5-49ad-4c63-8c0a-f01687c27093.json and https://artists.proofprofile.net/proofs/artist/803983f5-49ad-4c63-8c0a-f01687c27093.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 0xfc152ef8811bd9ff1a833df1a1dad561f1d049f12639ef62910d6683aabbebdb. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/TCAEO1966813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53428e6e6eafa6cad72d3e1a2ffee1e02e924857768a2e1f1512d2b59ba536b5. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/TCAEZ2031743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4156fbed5683212aa806d537efff11d4f97ce4b3b71cad805eabb9d7548d2b8. 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/TCAFU2171995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57b8e07eabbd1825835e767aa6730a39a0d238137305fcca779cf71d801ef87a. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/TCAFU2171977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d05bbba35acce16f0cce3179d15551a5203cebb428ba70327789b1e5b342139. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/TCAFC2019051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8a1e4800ca7440aa4e5be0c076f5d544286cc71006e3cfa07f4029250b19d16. 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/TCAFO2128526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed0096c5625cdf6612d1d45ce740c68a041aa6360cce4cb3351dfb3f234d3aa2. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAFR2120686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc929f49e873f4d922b6536fc2424f5ef32c550d8530065b8302317f0b0f8881d. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/TCAFR2173032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6e06a28a5b6d45eb1ae25ba0b0fe06afe8ecbbf440727d7f65611d78882bc67. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/TCAFR2173117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa13dccbe994797c0a62b6e7a8b96f611390b1cb382f6695371acfee37145eafe. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/TCAFR2173073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2420ff53794171d82cfeaae3bd519c9982e03491b0c772fe996d49d722cfdd68. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/TCAFY2153960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db78c712fc791d55ff51ba1008f6d0eec171da7a3c1f8031e5058e9b9ebb4e7. 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/TCAIA2463044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60d7a8ba61bd2cf48db99359dcc63f734088ef0ed9466f721f542b67a6d474a9. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/TCAJM2592268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1152385a040073ce7a971c2d2871d0187c79ff3bc9a408898e376c48602bc4c. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/TCAJS2519565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01dcb288d4a3e737be2547b1ea3b1ca4e06db0dc0b4e2c094ac8b38405e2c610. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QT6622539530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f3a5d0cdae36d34b8b26f40e006530625818e7f90a56916842f5bbe45ea374a. 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/QT6622585935.