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 0x519f080a8a98ec853e4ddeb6087661807584178723b7542194f2ca5eea854418. 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/15050aac-fd8e-4b55-aaa7-f7dd64406bbb.json and https://artists.proofprofile.net/proofs/artist/15050aac-fd8e-4b55-aaa7-f7dd64406bbb.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 0x3cf3c813cac154c4ee7991c9e70ef6e45761f1cb2edaca5ff95846b8cd946c59. 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/QZDA82308340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6baebbe1a5bcaa347a82c77b85c0e83d9f2dbe2b467a1c302577c1df2a74bcfb. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZHN52387111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2a49ab5146566bf6f425a32ac74d7e5caa733bb3be1bbdda85f628ae0afa632. 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/QZHN52385472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf3f2879065cad24c7c2a9cfcb84d7b3678c57a4bb0172923d6aff115db97e63. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZHN52385473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3904fb1b2f160170508d2c2c5659c4bf84403ce39967089b7bdd98f801998acf. 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/QZHN52385481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x964988add28a4b903ecaf6a338467a235c23afca7b0792103200b7386ab75468. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZHN62335455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x274ff78cc830cd4ea0b3552b1cb5e72003355345a92a0c020906741bcb703846. 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/QZHN62335457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88e73cffcf5fd395af4dec950723cce454585f1d7f022f185bf48c69768efa44. 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/QZHN62335462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc397c28312418ad8bfc6b75b2a7b3ef9eed3c58a5e94e51306351adf1da40f21. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZK6P2320455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x903a6f3383458b19937b24572a1f558f2295af72af3d8454f8ae6c80ed130350. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZK6M2346130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e0b04b343b93e468f305312bde095ab6fbe4efc0eef136d1631d75bad384bea. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZK6L2370563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x021b037d8280903df8d7d86fc3c3a599bff7b40a9d8d3b773a9dbf47922068ed. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZK6K2360689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad6161a42dd4f35478576131ae301e482b7e490ab922c516a9eb9a00b1613a9c. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZK6K2360690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d90772d849f237b2a5c7251ebb2fe240c27c0740281682b217110c52bbaf637. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZMEQ2307167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf99acc838afb92a551c838354b64071162c83e9e751459c9083c753c9927439. 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/QZTAY2327336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e593c86feb3a4a3e50e02163e3468ebf3a3881eb7d17c07c2c30a48d1664f8. 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/QZFZ22448479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x610aaf8bb57932d424ada4fcf2cb72fb3e45a984e30b35b3f1718829bb6ede1f. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/QZFZ22448483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07898d4e196bf542f0c8b5f6e5628168ba4e3adc88b9de93437ef1fb0b7f4f80. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZFZ22448485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0137fbff556cb00e842c14cf4e50fc9c8882fc19dc5871b10b529ab13e48e20. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZFZ22464561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b166875743f8b975b17509b2fceded73a7b5e363839d6d500b896b4e858a119. 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/QZDA82411462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c4d0a3fa4fbe09e2e9b7d360d683659ed1e84920d5d8b5cadd94b6d2cd6c527. 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/QZDA82411464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a2790a6d6e468f0883ed2eff796ede64961d663a16d2d2d3b4bad3df66aa6df. 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/QZDA72589665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebc09baea5423cd23536910e421cb7a185a0959d3aa0abd1dabc692248b6acfd. 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/QZDA72589668.