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 0x8ce7d268aa7369973c2f3cdcbd53e79c30a10e5fdd85cda0ca93317332aaccf5. Chain 2 (Bitcoin): anchored in block 953707 (2026-06-14T23:22:21Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7d0caf86-c385-42c7-a84c-475822e56ce2.json and https://artists.proofprofile.net/proofs/artist/7d0caf86-c385-42c7-a84c-475822e56ce2.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 0x4b188f8a81cb5a171331fef5cff839edbfb0bec04f98790d9057ea726fb51fbd. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/USLZJ2537498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcffa0d7f356eac0012148b91a1b2ba6fcd17405eb7b73c14eb331ead241d558. 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/QZWV32436283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eeae432fd6aaa8d705ec8d188c1b7b854d511e371ec683e26b98ba937ee8dc6. 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/QZWV32436305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc447fef4d3a2548a59d0827273773ff4c19027fd03135988e0dea5b59096548. 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/QZWV32437443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc023a1d51f4064b971934afb95f5cb7634c466ca73a80499032faee90d0501ab. 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/QZWV32437444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x550ac0e1ee4aedb966cd74756bee9b57b3eed80df4aade1d2b0f219ddd3027b5. 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/QZWV32452513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5c056c86ab307bb81e8d63902f91b8814bda8fb1eac8b7ceb1abc005cd8afbc. 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/QZWV32437446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c1362255a571232a692ec08e28cd359da47f44e50d127840efb278f0c669a12. 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/QZGLS2411219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ce55d8cdd6a4b57aa867608c75fb8b00644e6109c3f24e48cb533b5bc61ebd1. 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/QZGLS2406108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe46c1f1c332b5ff94d605c9705a22966585a0da9035c2fbaa3de793673b0d10b. 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/BC52P2300063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf00be4d03b74a183a66c9c943302b40b5a6111ffe8fcaf775347d83f67101545. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZNJY2226547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x643237890f60d8b4c6357543ec675e10e7ca75aec5f8448fd84d37459897b0bd. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZW9K2447683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe88f8c3dc56dd205c76867f4cb62e12ae3641e89d06045440d7f6096d057c0ba. 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/QZW9K2447684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x572a087f5ab34150ff278e94a6b3c4619fde2fe3a537cc148a3f6b6e154772e3. 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/QZW9K2447685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04d15083a32d5f5f7f5fc2305a7952811272354f6006bb2fefdd779a7450d0f6. 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/QZ5AB2471458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f2440a264731676d4854b6e6268827074fe1435c7fb0eb84c061fef7a84c57f. 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/QZW9K2447686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb67236d048905ce013a686b1dc0c96172f29373c7b38b0f3a9ce83bcc5e567b8. 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/QZW9K2447687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e2063a17526e55354d2969f4ec05a7b5dac7df2291f3ec8ec328bd36943c7e3. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZW9K2447688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea47511206f2e79df8a7775492329bcb2e81a41149b091ad37724f5309107bf. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZW9K2447689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01ccbecaa5dff08cced153177002b5436a414a3853508c0c27f03977af88910b. 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/UKXN22553207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2afcf745d8d8ab20f3dfe61a162ce70855863ae1bc9fc5ea7caa752ab8265667. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/UKXN22553208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x107f9d10cd6357ed3c42ce79cf808d0e669e7de30fae65d847b915ed4a328070. 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/UKXN22553209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b63a878a788d77b1e13b406f91e371b2f7b0d9ce6a9887694366aa18537f67e. 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/UKXN22553210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x305751f061f0fa92eefe002e7ff5b005f3adfb34fb1b4556fc4e22dcbad15d56. 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/UKXN22553211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81c979dbec041a42db505fe7367cfb88d1bba86c4115ae9436287f278e0fbbc9. 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/UKXN22553212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40242e8c55e3133cc5c34b6d77f7c12026968de07d0bc74fccf5435b955bbfdb. 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/UKXN22553213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd1ddfa8202ded01a97ca89738120bd6f59134ab11328fea770e8c32ec6c97a0. 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/UKXN22553214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2d48c959c0187b3e44b9db3a27f570783808fc0c3aabab74ca3f4f6202f5db1. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZNJY2482026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x199aafe1e14e2ac991d8c1368de1490ff00cdbbef85c8c3dc112c1bc35e12dc1. 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/QZGLM2391442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cf2681a8867f3fafef998d502857cbe917c2237ce6f6ee971abef50f9d53307. 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/QZZ8B2438572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64870c80c1832a49b9bd83a608513032929bf0b63d20df083deb4fe6a852b7f6. 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/BC52P2300045.