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 0xf25a6f4a679d5f59e50530e3bcb8e7475c47787c41b8730bfa2bb1d84ca88cde. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6403a84f-749c-42b2-b761-e7b2d3698340.json and https://artists.proofprofile.net/proofs/artist/6403a84f-749c-42b2-b761-e7b2d3698340.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 0xaad9a2655b7f2c5d57a29db8c89043be57f5482c736576c220c68981b36fc4ab. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/TCAFB2054354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8daee712e18c83cea6a00c596bd36211fec74f85df4bd8d6cf0dd05a9ecd7f0. 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/TCAFP2117497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4609f841d9c721c80a74177eb96ed910fc3bc7514fb627ec1710406bb0c27131. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/TCAFY2175325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3650cad26e50b46d49feed04518241e1f00f094a31fa3afa39b3d0a0443d500a. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/TCAGF2288158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf13449e42352af5d1c0ca7a85c82fa1de26256f5e9b61891eb4e086e3bbc7217. 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/TCAGH2262652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafedd60fe551a95d8bf26dae0f11112dfa661f07b2ff8eb00db7476b9c3fb999. 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/TCAGL2218793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b0f21747d8de63b9e6b6404a65e57b98e58e5ada76a57174677c4ee0af319c. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/TCAGT2345487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa611af85a00ebf87904b0159afd7a119ba6b0279ccd4a51b33a4fc6a197a7ce7. 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/TCAGU2325276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6608a8f3b9a2f6f96082f4b0b7659d7377ef44300c3fb250a73c46d262cf5d4a. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAGW2381687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57870ab4f7f4d5aa2c90c5864e5fad64677277d845c6f0539c1eb76f055938b5. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/TCAHK2356184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16536569071b4d2a8e62f38da4c0e830bcaa8f7ee615d377a4ade367f5660ef4. 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/TCAHK2370767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62cfe6c8ba178a428ec48c415503740ef1c4255eb9e34597a3d21c93671295d0. 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/TCAHQ2331253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6de6f8969ae74d205c08fe7c1a0071f9a667e47600122031dff8e3a8074ac487. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/TCAHR2309769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e5164b3a4b059e3c9c6c904effe47279bd9af940f66c3dd7056c759ec4ba56e. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCAHR2309788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceec155f8d37b89959eec012c34eee6bf00548d0b4e10e9a8ee69eb372637142. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/TCAHR2309798.