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 0x8d5116f074893e3921371b5abe71a04ad9af057c27dee6c8981cad85db1611d3. 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/6cdc4c62-0e19-4df6-92d2-fc9b4fc86993.json and https://artists.proofprofile.net/proofs/artist/6cdc4c62-0e19-4df6-92d2-fc9b4fc86993.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 0xf4ea078c2981beede0d1d5eca726cf3a52fad250fcfc497b4a986143ae0ed27b. 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/SGW502357597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4455b311dedaca7cf80bf802bd0589ddd08e98b88a1fce8cd9538002dfbbc4b0. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/SGW502357575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1c5b5c908b8ef0a18b35baa7996d7e01ef5fe5f321c87415e9c4bbb23595b59. 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/SGW502373528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f4d97647f501ae294a74b2cb175bd5aa956935e69091d78cd353593452753e5. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/GXBAV2319044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e509c3e072cdd083d940be9c4cc96e50b0e2ae0e6e39366faee3ab6e85da6cf. 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/GXBAV2389072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d1c008450e0da1e160e1a98cf04111a822ed2261500ae59c3a8c598f375356d. 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/SGB502473125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2ccc16cb9b99079df7ae17070d0abb8023ecbb34da20204ba3eb2fdd434f433. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/GXD7G2406383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe93d68b051f5957b2ecbaaba54234ab66eece3ca040e13f8ea4e1f253e07b6f7. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/GXD7V2226896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09e49d60b01f1de1ae98ffbcfd67a7cb10fd5e7f6470ce37bea583fca573699c. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/GXD7V2426667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31515708152a3a02c6ef5dfa5b68645fcff88036622bc8247d044c5994f55d9e. 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/AEA3A2426139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2ec02732f740adcf681b9ad03501ffa4a8cc2d18fb0a8f1bde977bd347e457d. 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/AEA3A2491677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe282f589e4ea85c812557470aa3b80aa734ff2d1a76a0d0b3ce34fdd4e4da357. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/GXD7G2204825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eca2e242544856a1b935a102f4d0c2f97ec40fe580db327971762128097e4c0. 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/GXD7G2278829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a75883d9c264f11de21d84e71fe7ed2db544e41921eba1a9b2535d757d9b638. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GXBAV2513254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0d67fda5687296cfc60c5b34066e04ff3951471030ab8388d9dc333e78660d2. 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/GXD7V2547169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06c66d6cb4b41e61165254b5fae0be137c1b06ae1609b31c1ef84225f332d738. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/AEA3A2596725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8862e3940d1fcbcad93f4afae1fa0fef4550de810146990618eeeced6f25a326. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/AEA3A2130594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2841dd96ca6631f8510e6eb37170524e5edacbd653994b1ba2a4558755370341. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QT5M32533383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f3cca336eefc6faac03d64d59e105f78e6db1506cd2410c78904dcb87e183bc. 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/QT5M42561059.