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 0x4d724d7dbc371d89e0aede7169ff892cc9cc77520c6888a78b79306d99c8ad9a. 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/76b4914a-315d-4488-91d2-428a16e8a67d.json and https://artists.proofprofile.net/proofs/artist/76b4914a-315d-4488-91d2-428a16e8a67d.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 0x10c4797670976e08ad41c0d2e0300eb6b9e6b2b7fbd2df9f10f135e05dc3dcbf. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USHM81537985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56efaf44a1a19004f5858bc28bb3e8ce90e2d37ca528853da5c91d813a3c028f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DEX261900412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ecd85edba31fe6ac6e9572e4a42ca35b84dc83706191afb56180e465c858fb1. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZFFG2000601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x973c33e5d0a0f01014894ff4001415538282e7374ec4170f8636cff4c4ad362d. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/US83Z2127771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc57dd1633c9e97059a1e12e96cf369086a526f6a07c4d738edf53d4854b12749. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/US83Z2137703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7696c3019452daa4c2d230700de8a0eb52b9f31d1d695fa3948e6639fedc5a7c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/US83Z2137704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aa82037248fb89425939e30372c12a7c00ffa54ea67ed4bb34530d53f67db63. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/US83Z2137709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x295ac0797a98ae8ef781607a542521f2529a04d52bd45d6b17ddf3991e93e7db. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USLZJ2263055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc432ba3ff4bc08dd9408bf79bac3a6fee986162ff6d6dc0ebffb90d874a3d0c8. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DEG932300197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68b7b3cb88fc606d0ce05e1157fece40f973dcbaf2250a1f66a42cef78ef34ca. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/USHM82387526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d9caec50211b652472320ae6bca62d4025ac3c603cdfdd068a73a56829b25e0. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZHNC2576222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb3d61d1d4f0489a980f1800fd391b8b6e5f038465a9a0e50c4beb6a0eb05826. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHNC2576223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef162fd3c4915b40cdd69b96737073a835b7096aed837f3b24d17c4641fc5705. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZHNC2576224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93d96f92d866a9312d8db8056e96900636e61b80e04613805265d7ac4ac1e559. 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/US83Z2226182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61f1931161ebcdbe83de2ae4f9e56c07107bd90a814bd62d97aca5b6bbceffbe. 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/US83Z1932971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4847b435a41c9f5f30fdb61cd5c3a7a31923bccdde98b353d3a6a1df8bfa175. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/US83Z1932972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8660931b94cbd23e4594e7db915b6774af9cc64249775fa9b252dea51d965746. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/US83Z1932974.