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 0x5ccf6acf067bfea041e73c1a1680d05255056a8c11e01cd53c9351a6cac1bcff. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/facfd8ed-5626-4966-83e7-1d1a53450904.json and https://artists.proofprofile.net/proofs/artist/facfd8ed-5626-4966-83e7-1d1a53450904.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 0xcd82350329b0143f23d80a770aee8ade3743c15ccd4bf9347d32591d2c00bf3e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NL5HJ2200039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4675cf2b83ed4e1d5a4bec6af0055823bdb4a3c190d8b7c16c9bb964276a7bde. 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/GX53U2041152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f701ddfd7d88ee60c23f67f189ab8f8445be45c017fab9fc86e5aebd2a5622b. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/GX3Q92164021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97a3e297a70b1d3cc3331b2785ef73bd4ab73a9b83fd1adcce0fb0b677362ff1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLB8R2000314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6926f1de5fcf86fa85fec9d8a48be93d1db50369f27ed377993f3aaf77ca0c2d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLB8R2000301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a009af074427ee7226bee305ac4b4607f8cccc19575d2a4bd0b46dda14be609. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLB8R2000303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce164be90e754459648ad78afbe01a1ced7652b341615fded2f69fda3000c8aa. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLB8R2000311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf087c86305d5d329cc10ebf79cbc786fb50f8c7281fc69e22ff45013bcc51bc8. 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/NLB8R2000306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa962833c1972518b1a93fd63f901540c88e9775bd9c35b6f860ce87faa65016c. 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/NLB8R2000307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x063de5d59cc783074eb0c8e3635f64d54375da280a84dcb908ee01cfd4b27f84. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/NLB8R2000315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36d6127acdf6e4bf6ea3cddc046f7f03456dc115c84892fcafa4587318e6a7aa. 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/NLB8R2000316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a66bcd820c226e3dd7c58612ff1b5270152490194524125deb717b76bb0f2d0. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/NLB8R2000317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfda69cdb8a2eb7af41f5d12d9282c4fd060a739ad55093767cfef966333bbc54. 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/NLB8R2000318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x896aa5225988af123a7726bc5af2ca6e88cec94e4c825bdb99fe18f2aa8a0799. 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/NLB8R2000312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3d8b9971495416eeda56514262db9b9da096d5c393ed918b0c361dfc552ecdf. 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/NLB8R2000308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8c23e172bf3e27fff004f883868f99ae8a27298d0b2b7198f4210fab7a76f48. 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/NLB8R2000319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd82350329b0143f23d80a770aee8ade3743c15ccd4bf9347d32591d2c00bf3e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NL5HJ2200039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93204940e6db8eda12dffe69279a4da50e366915ff21e49553bd3ae093882817. 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/NL5HJ2200324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f15c913417bac1e96a2e47ad702fc96cb494155d5b338b077873cf268f488df. 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/NL5HJ2200137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15d066b62ab23192179fa4939bacbfc5291561977ef9e314e784fb5dfcd09deb. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/NL5HJ2200325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe9fec3abfb5f6a32cb53a2c35fcf918eaefc0eb537eb06c9533e7119cedc168. 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/NL5HJ2100149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f15c913417bac1e96a2e47ad702fc96cb494155d5b338b077873cf268f488df. 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/NL5HJ2200137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcee56331598065bdcd4f4584d8b8b7236383b3e66b7c8ffcf25d8bb22faacdfa. 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/NL3GQ2100348.