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 0x7bc691ff7e65ac5e11f188f3c6fc9b7f5fe42f3b0a7582c6f8b3fcfdc3b8dfa3. 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/2b2d4ebb-e29f-4b05-a4a4-5a6dba36053e.json and https://artists.proofprofile.net/proofs/artist/2b2d4ebb-e29f-4b05-a4a4-5a6dba36053e.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 0xa8c8ef829c6d5a64e668303c53bb3a4b3f42cf05cad73d4973d65a8a0b32680f. 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/USMH92355488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3592491d5b666984f285d7c7edbf261e8a6b0eebe18783c6b43ed5f8027b201. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/USMH92355497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc951fda5b6b5073f500cf2719f71e7a9a99909dd4cfbc3de61bf66827bee794. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/USMH92355498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58ae65600d79451126258a4bac5c2326995913dd2023a110e6d8d5e3321da6a3. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/USMH92355499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b538acd6c2609818dc4142171d8358345a9f0fd72008a36f720191122dce65b. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/USMH92355503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x016a281b12a95d5149961d5e52e5e93f7232db5a7a5d83e9a254aa37979fa741. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/USMH92372821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadf266abe825ba9014b6aef8e86cc1b8b441098d08bf50e9069c905eca649f23. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/USMH92372824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da4471421d1d44e1e021a880e9a2e6b52479cb1c87900b4ce69161a47171a7d. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/USMH92372825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e8c3619ad563bfffd954590607c1560db5069260de62839c8af9f5034fd6c37. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USMH92372834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e2e8ece05a5844675130599f79fdc79099385829f6bb0a93ad1498f4f9834be. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/USMH92372836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fa705afdfd37f7d4de7bfaf6c123bb2ca369f48c01d7fa0359b60cce1a2f12b. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/USMH92372837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0409953de5c0074070d3efa33fd1f78c4e9973467f1b0a0b573cc91c65e7db51. 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/USMH92372840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b5b82687059ae9982da515f7306e2d7f4f30ffa9f733a319528aadb959615a3. 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/USMH92372855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1989aa3077b355ca065cf13b179620510eb395e50fd38d7c42f54fc29fc8096. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/USMH92372858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8483b78c85bb98473f45a86ec18919eff1a0d0c5a4c0638e3376f3ec941fdc74. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/USMH92372860.