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 0xddd902e2c77dc8f4e9ebf229e2f336c17cb89843fe8b651f43eb46850a51125d. 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/09dceab7-f705-41bc-a558-2247f0378207.json and https://artists.proofprofile.net/proofs/artist/09dceab7-f705-41bc-a558-2247f0378207.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 0xf7e37270d323940231a08082e58f3f362bc81ef6aaca003bcc06f6dbaf19c2d7. 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/TCABS1490030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7650482b89e59dcd858368724ea209a659c0ac38da658f09b6f0a772c281cfef. 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/TCABS1490031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc721940bdfe447e584d380ea4af86000bb344554a65afc1be4d097fd467907. 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/TCABS1490048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc23a742c824b6e8af2ecd89135f859200f2088309b27f4caad032ffc9f5d9bd3. 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/TCABS1490052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69aef69ceb5604edf06d6f8bf0630e80abc21de07f5d1763f568097bd3ccfc4b. 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/TCABS1490081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcad52a44a9cf6a27a2f98c038ea77af2ea3e533fbce7f45f632a0d5dd11fc3f1. 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/TCABS1490083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec3eb6c42d8d50f122e9b5d8b14ebf4c9b8a03cc927d17db58fe78250a0bd03f. 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/TCABS1490085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6511c72b59f86ecabc0d77886f364ce1c3ef6493ba288ebd00e4c21e413e3cb9. 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/USWFE2491261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa22c20d6b6d081096f806f9bedd048a74c6e7042e7fa692ccc83a938ddd29738. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USWFE1990596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf042c1891fcab74b5da0115c86b8836e97e086cf3c297c4076c199414cec79cb. 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/USWFE1990597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cd7b5591bbd31b84d1409f35e426103a8fcf742c59b34985e33aa7b9b887106. 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/USWFE1990598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8095e52d2f0cf6af4e80ab04ccf40765388180470f40be284ca581635caaa8e3. 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/USWFE1990599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa225898f1c1be6224a3fed1ac1558ec6ca2970496a21e4d4ade422ada44290a0. 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/USWFE1990601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac21c1da080a5e7886efd49307b174451ecefadd27252d57e93d9d9563f48ee9. 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/USWFE1990602.