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 0xcb09a5c7d22190ec71652c06b4eb76b2d4574ac2ad7e8a414e43d065261f66b3. 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/145f8714-f3d0-46c1-9346-646a6b4e3f84.json and https://artists.proofprofile.net/proofs/artist/145f8714-f3d0-46c1-9346-646a6b4e3f84.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 0xfbbdb1086d50ec2df9dc19f9d772d063714f2ac1d6e24a4d4296e4fa887e0af9. 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/NOCKK2323030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa50f8c619e73384dc6699778b1c6228a9cdff003c135e0b34d94f7a86c21348e. 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/NOCKK2323040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf257e00e14fbfec2910eb5e2650990dc66cdc198e9cb59310403c9b9c57e0242. 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/NOCKK2323060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e2cf9fd937a7d7c029519eb41c564309593c05a00ee0bfcdca0ddedcc6c9a0d. 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/QZTAY2422303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc204a87e635d1014cd35139649e08fa42501f05f27e302bb5d0ab5954796faa2. 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/QZTAY2422304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda624e5985ca9f439d8b92ef480081295d10281acc06e4c9ac1ee898524d1517. 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/QZTAY2422305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24baabc149f7351f5b8ac76ffd9fd99845e579496851d1b1a73de75d501da4b5. 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/QZTAY2422306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16b085e7da287cda8feb882b1323b8280bf5aea70e0327f5db6c0e15e609b200. 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/QZTAY2422307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2254a8e85747116f806c5b8eb05019c766f9bbe2d3c6e66d4c4c6eacb116acc0. 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/QZTAY2422308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d4be9e9d36da56dabc32f11655622ca81d31e778e900244bb63cf7dfcc3adb. 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/QZTAY2422309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x000cd0239e33e6d7f892c8b6847acd2d21d0b2870977a97cee858e8e94bb71fc. 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/NOX8G2400374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02e85f84a8f53c949cef9995824e516fc37a353ffe1473f8abdbcc82d7abd9ca. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/NOX8G2500049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x724883d2c50be8ec861fd831d48f7e75ee78f0c56401c00136474e4e5ca27268. 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/NOX8G2500120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aa484258908918b51410a6b536d23174476532feb09b6cef7df075755e4aceb. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/NOX8G2500121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x789ab0fc0d287dfbc8d205d07e2db65a4d79827dea120556b1c95f45f644589c. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/NOX8G2500152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61d769d8ae6db850a8c26a3f6530ee6c406e9fe117e7663ac0406ef005f9d7b3. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/QZK6K2485304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x277b602e072eec6dc72187f1db367ca0752fc527a5f4c8852b0ea5eefad01d86. 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/NOX8G2302039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9418990f5abbdc30dcff56498da92ea373816cd5810b59d426f20e1fb6aadbd0. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/NOWZ32300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64c6ebbd721bd4af98abeb321d132079e54f238402666b009c17be16b2cf15a7. 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/NOX8G2400166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bdf4744f8b446b733e49df3e048027eb975b2cddf030dc572888f9a544e2e04. 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/QZRP52362355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61d769d8ae6db850a8c26a3f6530ee6c406e9fe117e7663ac0406ef005f9d7b3. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZK6K2485304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe734a3fc7d62bd67cdf164b92985a3ab489c3bfda6bc3ac4d89a10c0bda3af9a. 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/NOX8G2500267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d5ec195263438e9ee044b487f00eba04a7370027603c806af64cf067e1b65b9. 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/NOX8G2500271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x647fd1ec0cc8fc983d47613bbfa47dffdbba134f8fd88b7aaf6a96b603a76a27. 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/NOX8G2500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x619c5895ca4bb7fd9367100d2c4e9cd10921f2d715c7f95b04e127a59e6ac280. 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/NOX8G2400082.