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 0xc9898a6376e861a702f673032ea8ba59dd09609abe196b454afbe6c4f9bdcdac. 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/28287791-b0ab-4337-818f-d45996bf4054.json and https://artists.proofprofile.net/proofs/artist/28287791-b0ab-4337-818f-d45996bf4054.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 0x781873103994e8182c8f01bc0c34ba58d6e43e5dddd82407f95c29453201d470. Chain 2 (Bitcoin): anchored in block 957778 (2026-07-13T00:08:48Z), 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/QZPLS2550747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eda9d448d11cd9fc18fd7bc88065f6d6b263567d7198c4c39759c057a537e0a. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T12:22:44Z), 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/FRX762334579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf500c3b090e79aeae0b847cf7f2dfd0ae1f91563839b6108865752058331f02. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/DGA0L2378694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c94f0015ccf9f8fd6e76df104a5f4c7ea3d75798b71eb479c9bbd10f5bfdbf7. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/DGA0R2318923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c94f0015ccf9f8fd6e76df104a5f4c7ea3d75798b71eb479c9bbd10f5bfdbf7. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T05:16:24Z), 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/DGA0R2318923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0de490a98d6e0d52c3490cb6873a8f1e1caac741229d648238370c801513d24a. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/FR10S2400604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf12987501517039d9cee234d7166a5728799353666d61e67064f410f474864eb. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/FR10S2400605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ccac5ce3a39dd036fd963baf0bad04be798da870f15a6ad001d6c343727815. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/INB942402151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63e88b2f2119f58306ff51fad237966fae61216178a5b92e36c24b89f1d13537. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/INB942515601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea32e78ec9cfcd9cf72b795fb66a9d84adbfd8ee3daee2ba2a5573f97c61c586. 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/INE182220204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36be5a0efe97da1dcc24c693613fd5f7d589e1ec774e1a13de6fdeec65572035. 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/INE182220216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8a394560c5b8f6589e71af027156bf5e8dba028f3631060d9e9cc288f226aaf. 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/INE182308356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe30256a82c775ccde417d9c8a7ec8dfb65aca47b0efe78d5aeafdbea334fbd49. 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/INH412212556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d4028e539aecb577caafde592018ed773db23882615ddaea40d1431554b8107. 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/INH412213011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecbe279a574d86036704949e57c30eca6e8601bdf8fc334b10d83275701488fd. 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/INH412213334.