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 0x30e9ae7c6ca33ae779b2621c214d70e8462b1b3aa935850dd22618c19e3e2b4e. 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/81625063-6bda-4206-b034-0d37f675e166.json and https://artists.proofprofile.net/proofs/artist/81625063-6bda-4206-b034-0d37f675e166.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 0x3bdeb8b09df2afe8ce50f09b308dcf9fde0e7e8be21355d5ed6c8ed914760637. 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/QZK6M2230832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ab601038bba9e20990b135781ed1743482953d2be7b0e9430cf937e08c05db1. 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/QZK6L2243833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99324dcccccff31327b0ccf7850c67c2683db9288c31004dd763076b4b26eba0. 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/QZK6L2243834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24b8f1fbbe3d05e73074b55631e22e581202917ef4de6153a769a338ba23050e. 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/QZK6L2243835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d87ef84b3df75e6d29fc60f9bf5bfd11688868e1b4409d1c3713cc5a3b4ed0. 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/QZK6L2243836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfec4df2943e49dd41a3e2b5531b640936a7c92bb3f235f5b47a0ec1dcd5d9320. 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/QZK6M2230830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d00a234ea223355c2dd356bc177f61fc28ba8808783aad7e0fbd3f1a377e8cd. 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/QZK6L2243837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4ca8f875052b674f93090b65a02e520daf7a9ca0851ce9c4a2acb35d7a1997. 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/QZK6L2243838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1071a2b966d8451db2c3fe93dced8c80e673305d739ef63fbd782e76d9d1fd1b. 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/QZK6L2243839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf77a52e55e7840dda2b3437ba4672c3069a19d461760a16d28558e83f8008e1e. 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/QZK6L2243840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7360cfb056629cf41e23020f035966d20c66aa78110b46a0e02acb31df92126e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZK6L2243841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bdeb8b09df2afe8ce50f09b308dcf9fde0e7e8be21355d5ed6c8ed914760637. 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/QZK6M2230832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb023c4f620d19594b61c108db93537e3cba674e96b790b94ba8d7b6c631a4ef1. 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/QZK6L2243842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb324daba4b543f01515b6f5f6d89bd10d8d1a8720bd8ecbfb942dabeabb3d630. 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/QZK6L2243843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2339d3d678be7e512c6679db2091c66ec004e6ace7ad0503ad27adc5f6c093cd. 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/QZK6L2243844.