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 0xf64a1b5ce92caa3181669f9f347bbde0b4e9c7a226d1e25c1b1c2724da1c3fcb. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f4139e40-85df-46f0-9b69-fd40bc29c3e2.json and https://artists.proofprofile.net/proofs/artist/f4139e40-85df-46f0-9b69-fd40bc29c3e2.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 0x6ca237bf826913ab31d27750372a6bc57ec2aff740e28526fb72218661800c56. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/JPW462470689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c0b45da987aae846ef30293c5edefd200163bc3bcb57f572176966ecb6da1a6. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/JPW462470690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9439c89f32703f80b17382a189a1d26f027e684e60fd8bf8d8d8a3b059fd0c88. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/JPW462470691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4759836148cd55316a1a5469a465b395a28f3952f4ef893392181583cc3c987e. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/JPW462470692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda31fae3b0bf7f2c1a50d4bc95b6c351fbc2e47bac24f9bab810f0e4761c4145. 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/JPW462470693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea951e258c735a406e6340486ecbeeebdc026153fc89bbec7f694f3a2f668f75. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/JPW462470380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13bfb0b29534970fbc534fff988e84573f63ab0a64cc7ea70d2ded5b2ea43b6e. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/JPW462470381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ee64fd96ff0e6353d282bff79eef5294b81f4b51cfe21612b5f84ab80bbe1c7. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/JPW462470382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24ae5220afeafdeea1505dedb7722445d0bac08ab73fd41e4a6d9086fb6adcca. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/JPW462470383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x507738d60ae7676a6e34445d74b7beca58ccc619bb0bbb48e6226de3e2087920. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/JPW462470384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x477bf472f2396fbe1cfb2660cdb886b194b5d34f84610d10511c7aeeffb3b8c8. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/JPW462477734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac79ede56056f5ed4fb663503eda3da28be9f6d358306ea97661b8ad444a6e7. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/JPW462477735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffffc4adb00d0a46892d5132c3422d4246513ad7e35391d450ef9c540d9329f2. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/JPW462477736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c45379826a31e624342bd30f3aad8fd5356f723b3acb3f56b165785d0cf989c. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/JPW462477737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74b6e6daa7131422fe723d5092b143d9b47bb311af6f28ea6016dd2912e7a8ad. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/JPW462477738.