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 0xa455b0db875b1bb613fa73cd8fc26a54c76b3a2ee0b216314fa28966eec7d2a9. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2732f826-a279-4b52-b940-7034d60a76a3.json and https://artists.proofprofile.net/proofs/artist/2732f826-a279-4b52-b940-7034d60a76a3.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 0xc893d03bd7b107397fe0577ce93cd7c4b011fc1c71b9d2108aee9a9163f6f620. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QZWFE2346496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25d695c3d3724c22e4b94820ea86d66fe89326a5940f45b92c3170979a6b2bfc. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/QZMEM2441920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3889641913a3ed7b51390bd72187fb8df9805cdecc536b7759005b283b803ea1. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZMEM2441922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe166f06a9774ed98d396d520f5eabcad9288e5b9536ee5e2552bfb69d5626cfe. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/QZWFJ2497435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa26675818f89c0565d5b7c87478ca79dbd66071ba4d39883b3ad939abec70705. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZWFS2450793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7359162e36067c7000d05bfd501fda1c36a72eb2afe67e60439f22d814a2f064. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZK6L2561548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x381c7e0aa097c1675cf470b70da0eb29fc471c227532bf3f2a62dd34cde024e1. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZK6L2561549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce3ca1e67e8d305321b29d5b41372039b3ea4f33c2b80ebcf25e726b812ec558. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T13:26:15Z), 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/QZK6L2561550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29d113c2a1151b6da999bf2fde42842bd40b2a6608edda032c21fb747870d01b. 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/QZK6L2561551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0ec22f76c906a004f9e5259454a542ab98f25a783ff89dea200e271ceb4148d. 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/QZK6L2561552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1ff8c98d678872eb3e8f2963c88965952e39f20c7ebc4491d7a834a792b6932. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZK6L2561553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2daccd258716cd90228b0cd54aa71d5993ba9c6564f014e7d2f1cba266a4fe9a. 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/QZK6L2561554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76b2295f1595d039bcd10870e41de29ab136f47ddac435b61bb34f65fbc64e76. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZK6L2561555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f96fd5030e4ce5147b1b354ad77d45b4f790ab7b2a20fbbac17856d55efbfbf. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZK6L2561556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b6f3bf06b8fc3f7481aa22556a92a933e533a53c05bf75d16bb67aad43dc1d. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZK6L2561557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f092903d9e77a92bca01296db9137b4a4694f84b6218dcba74c2d4157381712. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZK6L2561558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x940d5d46281f1836b45554f528a4af428f2cc1154e75a48444ac0a5224140d22. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZK6L2561559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c85d32cb740db30cf96e1903c11f19944f0b9d237c6cffa90488d5cc265d509. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QZK6L2561560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac117835d2bc7bf4585c6a5d11ee7714deb6de7e5f84be896cc1a975ae065df. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZK6L2561561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52cfbb5b2b6220389167cc3b1e8ddf844d19d20f94ebca03eea667b67d2e9896. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZWFG2452098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda970a825986195a939ea51d450b2fc1af3aa0e365eec98e9eacac5d379fbaa1. 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/QZTB52342621.