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 0x0728774ba26fd7353d2636851aefd453e6f3775020723926fb561a874f0fff84. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9119fd49-d4e7-4449-ba40-0b9bd3f175e8.json and https://artists.proofprofile.net/proofs/artist/9119fd49-d4e7-4449-ba40-0b9bd3f175e8.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 0xcf855481d10370a0b63f539c9e94e2db3f5169b12d8aa05c798f89487926eb2c. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/ARZ5J1200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6418049825d7623ccf90e64180c39c54027b50499b9be6eb21117c80e54c1b3c. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/ARZ5J1200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98c266bf02c149c480e4f2923a897d0ebedb4e70630a1116f52fba751af562df. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/ARW3Y2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6363359996026ab8fb4f96c75a115d2303f2e17437bc31ee21fed69975b0356. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ARW3Y2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabb3289697cf359c489b3ddfabea9114532234d168babbbed400014bfe3b4962. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/ARW3Y2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf07f427768c2051faea45ef394c230ca916b3cb494d6c606bf8739a557d4642c. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ARW3Y2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbede0bd427022a4bd87ed7bd790bd1a30ba9b100fdbd2247a90be3177e9f9d20. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/ARW3Y2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6bdfd093d58cb7beb0ffbc7afc2245c8f443a4d14a2e4914ef7cab964fd7d73. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/ARW3Y2200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb2c0caeaa161d80a7db3d3db15b179cd6781d5a77ad2ea7f1b12137907e597. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/ARW3Y2200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4669bb1ef0e9264a56474c46d00b37d2f4b478ea2ae1ef88bab8f3a5bfbf3e66. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/ARW3Y2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe495a4beafdb12a99ef29e0c141657058d5cf7105f6d3f4b2db2653e8372b960. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ARW3Y2200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6502473968de4d2841072ad2fabaf75c2330a492f6487edf8519e30fcf76ca93. 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/ARW3Y2200014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d2f1ce409d80fa930e9d946b655663a159bf5055febb8c1e61b116db506fd68. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USDHM1904341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61c7284967b307ea297d0e0b27da104c559a7c3cc669b80bd49dc7d1fcf37c97. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USDHM1904347.