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 0xf13b68afa1150d3bf17bf71a7aa46b249d7fc4c100753ebb9ab93db6c16a017d. 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/e459203d-5f67-46d5-9d14-e70b83725a83.json and https://artists.proofprofile.net/proofs/artist/e459203d-5f67-46d5-9d14-e70b83725a83.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 0xb65e579ebe658fd41112dfcfe8a375cb6f444218ae01a4de3d506677ed412414. 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/MXF367320161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04e70da907454e4d7a8ea1735ffda350f8002ef5cf34ce0510ba14704b4edccc. 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/MXF367320155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff68744df03a3778bc85c0c483505128edce45f8baa020d22cfa29d547e8b1d4. 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/MXF367320156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec171118c865c5eb4c8848887080e77e78fb2edb337a7a4de76f25d640ce4de0. 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/MXF367824862.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d0db0b4fd7ece00ca5d9da7b76705e316deb9f625775038f00f516bc3e62bc. 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/MXF367723823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac5a704d89492397550cbb0be34d9ed0c8f9158b5d82857771962f1ae020a0ad. 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/MXF367320166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7085cc23081d3ad61b375954a926117929e61d03d5fb1cc1d9968485f8601162. 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/MXF367723829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc3ac01cc0dbee2edb3a60b95b0014f972a97748d7da3b8f024fbe186cfa756a. 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/MXF367522490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9dd7ddf5b8e6e0b4f88207b473013332afd5f42e8d1f9c8db9b3dc537d0b116. 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/MXF367320168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d39c456132d47717baf783bd54aa7d51b6764cc19ab7b1b5f2ced93d028c8aa. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/MXF367320158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83fc9c50664511fa81a244da09b83a6376c27a8f570a8b1976abeace236aefbc. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/MXF367320153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71127ef0f3c849cfc8e08a17e42a0f0b250736846eeeefc793149a8ffdd9c1ca. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/MXF367522485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c47303e2f492a34075f7948aec3f8c4ed83755d485858346ec02f538ff038fc. 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/MXF367522482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0650af5b12392094030a2ed7da2b51d32f3e959dbcb7c6cf237ec2d3b75113be. 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/MXF367522483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30402e2c8ffc3f33f8a563c3544b31ac6d38d1aa3652a648e5761e218d131807. 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/MXF367522489.