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 0xae784a76237af87ef572468db4ac6919172ae1775a56cd4008e5b97b80a393ab. Chain 2 (Bitcoin): anchored in block 953667 (2026-06-14T17:49:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/56f9362e-4615-49fe-8d41-ede85433131d.json and https://artists.proofprofile.net/proofs/artist/56f9362e-4615-49fe-8d41-ede85433131d.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 0x1bc9a4ad418629999f07d2dc5ca40ce7c599488afcc8b4f0bda40e132772e613. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USY242483920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd436b1972281ce00c8aa898d4ab6a514c8b5486970248712c8e2b6d22f3f50ea. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/USY242483925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12053aafdd51695dcd3dac25901cf2e3e1b9902fe397ebcd4d53b65e9bf91a31. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USY242483930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc9479b8fbca98ecaa515e0e7ff3db69b9f0abafbed8e2022005aa7d3d1a53b1. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USHM22022353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb568a422830e485d235e74b45635160a1c85958bd6d735d9006637fef3a4c5ee. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USHM22022356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34ca785eab05b56d64b785ce37f85f931644098a6ca2eb44c8f7638d553901f0. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/USHM22022359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x877de7397766a9ff93afcf83c0e6a16ac938b10fc0e1911f467174a013fc543e. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USHM22022360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98c9584db7a8dea6e74f152f079841f88038aaaeb1e1e34f540a5581399ea08f. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/USHM22022361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3797e896b7127b19c246b8259ff2effd8168caaa9b92a694342effee78d0444. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/USHM21815235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35a12dfd1a71289b17dadb9b122cc3dd15d34936b89ad1038d9047074168b80f. 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/USHM21815236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36a065a6e7050acdf31092d2b2581b1d6e971032a3a42c1338b89bb272237e6c. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USHM21815240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41e3be37f6e20d05d7bcebf706a86436d6fa72b5867dad78c2158cdee53f7c12. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USCGJ1708751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7309df52ba6f447146ee11209264e7ac6e3ca76d55d91a3c4ba2e304dd9079de. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/USY242428463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe574dcd92e16fe409715dd2d819efe1e8e2d9f7e006c3737920f4d41f40ae75e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USX9P2442851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14c6add84deaa686cede8689c06f20030d27c192cdbb22d31ebe837686c149d1. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USCGJ2451265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e7606ac003fa40bd2c5cf697f2a3e2d94291f4a552e7cb1373e365926baf81b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USCGH2367102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdb0d90d75eeb13c56666f7109ce7909e3562ce77251d09794369efcac887c4e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USCGJ2200764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x226f6379b30ad3d497bd01d571ab4d22b5a22cf54e7a94533afe4e729bf34f75. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USL4Q2155913.