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 0x7c6711b2d83ca30edcfc8007481d904abab88cc2b6823c1c790834c73f1e65ce. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aadfd16e-ffa7-4106-8e62-934ed2d591e5.json and https://artists.proofprofile.net/proofs/artist/aadfd16e-ffa7-4106-8e62-934ed2d591e5.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 0x9958bec2bb51971b0ee0675438aacda9c1901d3456f592cfbdcd9b294aadb109. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZMHL2494125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03af01db78af0ebf07d0a05178b78b92e65614514d2745ae218b93bc8933af8a. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZMHK2476958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9425036bfa0033846e0694578113d1360721011f7f1a8b23d12c555f138f365. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/QZMHP2469165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99d44b4467b046e6273833ad7a496b7b26234b3098bcd7bc56883f51fc6c86c7. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZMHN2448427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8a9510a01467d368fc80131bc2c1d1e4417fa9aea0ed7c346095416c4e06c6. 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/QZS672429638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb511e006c613732a76f6922524b10620ac1a2abcbabe995dd1f26bafe5237304. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZMHL2465683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc7bb951f0fd0c5099e9a483814673921a6f2f638b643430b61b203c942304f9. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QM8DG2435564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23cd8b6f77f5bc7e7a3a79334fff6ca89ef34c5e7e03e644f7885183a14eb180. 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/QZMHM2338507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40eafcd045aa429919ff037d90a84744dcdc7e10a816c7af863885d1bd57d883. 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/QZMHK2394230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88e377cd339a5ba66d444eda6a27a938c996cb674ffcc056b391f9252126d2f9. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZS652260305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e962fb30db37f38fba949deb74c8e88fd79f049c5a645108da164ecd63fd5c4. 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/QZMHK2296959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e611f5dddda06102e78478febfb92a22df87a39e7ba145a54d4a2b81fd3fcf. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QM42K2165707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52a3f29eb9d306a8ad4b3cd4a81e82a47662977ba5185b545e8c8f6a10b1175c. 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/CACWV2459635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf570a6d39a95bccfbcc9e8aa246d6aed7021bc97092d0ae1882215a14d32434d. 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/QM8DG2494717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc4461fbc881bcdc1ed87a037539c7918bc7f1eae5a3a16fc7af210e16db3a89. 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/QM8DG2448481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b6a35597da159da663ce62782e444039ec3d1478d4a49373f2e68340fca9c08. 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/QZFP52414245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d81fc06c323e40c14f7f85587ee412e9302132bddae317a69c31a4b5cb6c88. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZS632354871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbcc2ed7d91057b5e73a31269c75286842039b64fd00b54a4e39f3d8c4714166. 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/QZS652380579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8872d533f1b57b57d81c87217d3282f77532505e2cf60125b6d79935563099a. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QM42K2373176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65db8cc7e22c9c0d039012e2039b7fb4178fb8b562dc07057e4769c9946f87ba. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZMHN2367972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4290609649ead5cc0ffe004f2859c59bf4f1d455bfc816feefb50e3a16389d4. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QZS632328646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb3b2204e59f4a00ab3fda0a441e76070cf0c548aa2baba605df72d745519660. Chain 2 (Bitcoin): anchored in block 960165 (2026-07-29T23:29:40Z), 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/QZMER2277031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c669ed0dfbfb643c4d0a0b5d36eacb7baf94c94b411e2065b134c986ca3b963. 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/QZMER2277032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20ea1438b586bfcccde68c35486461a15448241133f0787d924a488a4fda62f1. 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/QZMER2277033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03a6a3807306553ca2de4afae530bf0fa9c982f49d1c38015ec1ee0477d7347e. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/DEH742307826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7283775f2fdcb53f721d314bf57c089a0eae05cf510987f10dddc773d67e3c72. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/NLCK41091801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd074237b12f68444e522daba0cb256746e32cf234fac57bf5b3cd565ded50d1f. 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/QZS662423585.