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 0x3a1d012b88abae1a4af07343dbe37a9115949c7849cd0ef0a9a16575f8b4ad88. Chain 2 (Bitcoin): anchored in block 953754 (2026-06-15T06:45:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ad0e7a8f-7bb2-4d0a-843c-51aeee20ccb5.json and https://artists.proofprofile.net/proofs/artist/ad0e7a8f-7bb2-4d0a-843c-51aeee20ccb5.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 0xe62e9e17ae62f7519d00073e438add7acd0d897e54c2cf79d222b22a469977d5. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QZNMZ2362895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x328e60f50c5531a203dff9d8013086ea2f3aa93cfb3ddaca27ee96433bd1d383. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZL382465756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x720d7cb21d56adb3f08848a5692611e0d84dc663f6836dec4bfdf5a210885dc9. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZNMZ2435561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadbd5401bb855c9cd1b0fc5c5fa2ea7b614bb838dc00d74d7d81f5e46b58376a. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZL382510675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc39fedf31ead2e83b82113960ee7d2e3dcf8ac7a9538f3e032d92f9c19ae55c9. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZNMT2505189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4f3dd34801308c0c9a92f4efd55d3c6b2fdeb29325ed3288d27690bfacde48a. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/QZNMT2505190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d3c59cd227f89e8e394001e9119f60ad889325fc14346d29adaffdc5b3b4061. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZNMT2505191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x753a8748c9670b588d9b2e9f353672adf2428e0c05eacfc7a5b8e4b0e23b572b. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZNMT2505192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23cccd9c63caec9a337c196d68941ea5355fd92b19a061d8196958717d141cef. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZNMT2505193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c9e5cfc276e53af831c7b616dbb42c84a589db21901f860cb7904c34e1d4adf. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZNMT2505194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2ae433cc00b755261ace5b979bde9b1a7691f9fea920951a429f1b33a4549c5. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZNMT2505195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba7756e6d8a2a1897a87f896c0667c56d9b91d151447ef505ae28c32b063930c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNMT2505196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc37fde321051e7dec3c64b4d9f9a3054261e71b14fff86a1df0aadbb8d04e3f9. 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/QZNMW2503758.