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 0xbe379b2ceb573ff26fa1bc37950aac45b8523968cba06636d8519ff52607a9e6. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ca8364d7-8852-42a3-a3da-0b7cb2467a36.json and https://artists.proofprofile.net/proofs/artist/ca8364d7-8852-42a3-a3da-0b7cb2467a36.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 0x04fe358f958aadaccdd52a81e56e9650d1343c43708f9b522ef5fda53c731fa8. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/ATMI51300170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x428617221baa4f8d6df78c8ad762ca8acd1812a7d65e5a947657ee44ad37ac9e. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/ATMI51300168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1429f20f51b8186226a6b3633d07831b87e34de0efb23d9211e9961a5e7ffe66. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/ATMI51300231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f9596c968df706fc656697838d77e1fed6fc2d4fe714cca584e42b28160de36. Chain 2 (Bitcoin): anchored in block 958697 (2026-07-19T07:58:24Z), 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/ATGA41801191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7051b165fc706ecc4befe6f209b14d9570819a55fdd846b95dd88e96303ee4ce. 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/ATGA41801194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5bd0d11c0b59d262e54177ca4c3c950f0b7db7060154da19c7c2cc93d927f5d. 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/ATGA41801200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e228e44f159a77e2363ffeb7f1e3cff816c1c7c69de7acfc547df4879bc45af. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/ATGA42102180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7afb69cce3138588b55d3e68962be01950b8e3681ba804393b2bcfc42d836c34. 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/ATGA42003202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x937785e6b115153a2abf58eb25748dd7389b65988117bdcfa62525ac24d67c20. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/ATGA42003203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e34beb031928f5fe44ee52a3e86f22ccb77d654447eafa2c7b40ee974380b3c. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/ATGA42003210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a97cbccc5636e74a00f59375e72ee36e6111f2b7549b0e477a475f612a83dcf. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/ATJ872404190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72fdc14d9bc514d811e35a85a46f637a6a55474c63a13778cf24e05f31cbaac3. 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/ATJ872408230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacedd68a0ce36eb591dd4f04900ae8346a57916251b5a1cfbd0b48ab0610ec33. 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/ATJ872405240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a365625e982fab5a11de1f948e6516083156a020a8ae7f2613c012f199cd76. 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/ATJ872406280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeff82a886c22c71bcf4f1318448d91f136d8dca0a4e3048a117e3694f9b7d15d. 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/ATJ872409130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd883f6f15b1e2cf8c1118b342f59efa6694506c41e703218000c7264a6c52c58. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/ATJ872409131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b6531a7b4dcb9b67f35145349abcd3217d11a4f6f40ea3732e2552af0f26b75. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/ATJ872409133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31bfbaea54aef9d77a100b81db34ab719612af06c74d3f85502f598180f901e3. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/ATJ872409136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eb7435d1aed6625c315fa1f22097929425f8a11731ef69af2fc73b34f9a4e73. 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/ATJ872501310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b9dc0b57419b3ac0451fc66f660125c19dfea3a6c1bd9046bcb9270264579f. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/ATJ872502200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eb7435d1aed6625c315fa1f22097929425f8a11731ef69af2fc73b34f9a4e73. 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/ATJ872501310.