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 0x4c280bcc9483549558387f04c61457a5f13ff529d1416d3b4bc11f124dcf5b2a. 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/d6d5fd70-6088-41a7-8bdb-34a75a55e39c.json and https://artists.proofprofile.net/proofs/artist/d6d5fd70-6088-41a7-8bdb-34a75a55e39c.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 0xea94cc2568c06d7bf701e4b11a59bc41b769b1465bfff5bafc8ff6ac5b81fbb0. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/HUA611700044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5abcae4cf5a175f8ed93fbd8167b5be4ae37c65d619780abc182651b23532c38. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/HUA611700046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dbaa678ed531042803b4e2807527b492884fbe193a78e564f79d44eb17187a8. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/HUA611700048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x772349a239a268743b76e54b707ea37d7a4270d9c330f0aa3f664b6547d5b2dc. 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/HUA611700049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x381c066c3a34beda09eafe09a90b0596128f0e373b77f09e7ec61c8a80d142f1. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/HUA611700052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6e8fbeb656c562b22ebc12557311d36c90200631b50b4e3bd59d16632cd35b1. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/HUA182138701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c2f5f063f3b0099897373ad82c8f23c98e498c93a6c0a25f385fd5ac6844522. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/HUA182138702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa559039ca0cd0b58dabbd1189dc1ee216c8ec3461b71b4ab12f33229710909a. 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/HUA182138706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd17eb986ecc7f64ce9a78b5abf6abaf9ec36f901bacd849c8eaede3373ec2b12. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/HUA182138707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd94a050f7717265794736c0792416e4edcee3280f2ae4ce9f3562ffe7863d4c. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/HUA182138708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfa12d2e1b5714fb5bdc26c55ee00f7969ef6d67023430ed98352ae00911d3e6. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), 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/HUA182323201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a543d6621f41c76653cda2017929bd3a25a37d14dc48b558667a517881b4465. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/HUA182325601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7a39816c7f967c00c0062cbf65e60d49ec06e9bac50253a50017c09cfc0fc6f. 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/HUA182551508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c27b5410205e15e9f756f06d734f69734320a20f10564514285dbafb957aac0. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/HUA182551511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c0f3f53debf8e3d5c6ec61315c32c8aabc3489a12aa07d8f3cf7f4de7375d0c. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/HUA182551512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4e4ddda1544f5b99bc3230c2b7fdfde4f416b2dd683356812a33050bfb6f116. 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/HUA612201576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x394448388a7904fbb53246d02c80f3836cd481624573bf47a786849f0fb9fb72. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/HUB981900088.