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 0xf81d3d653d77ad65200b38c610c11f7b5961e1eb0f9a8257f0eb284c29a506ed. 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/98123ad6-8928-4522-b38e-0befe4aadb4f.json and https://artists.proofprofile.net/proofs/artist/98123ad6-8928-4522-b38e-0befe4aadb4f.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 0x6081bd558b732fc209e1e85ec82495a17054b1402a1cad44ec16e404d924bf7b. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZK6H2244807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6081bd558b732fc209e1e85ec82495a17054b1402a1cad44ec16e404d924bf7b. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZK6H2244807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90c76c1f1700a7dc8e1ccd7f7e0a63c9b6c8004b3bffdf4d00e98b7ea0439262. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZES92210765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac3f1361d4c24a74379aa509411bda0b73a0ed41a9006354e2eea2291016a286. 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/QZNWQ2254889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5da34fe0c140bac244ea186194f08f95b48091485f3f9894c0453b5c1dfc61f9. 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/QZDA42209314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90c76c1f1700a7dc8e1ccd7f7e0a63c9b6c8004b3bffdf4d00e98b7ea0439262. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/QZES92210765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2caf241a8705ace5fa6e409655d17097be83cd55ec48f092b18b3aba23c95435. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/QZRP52198044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7367f36dfb02b97768e5584aaaf2cb18db1e44677c552a1e599868b1ccabc3a. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZNWQ2254886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d339e28562238c6d04a6943be5649a8e16033517b42c79daa954d2ae193c62a. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZNWQ2254887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc91a98e5b49b014dd8ac86fefe3bef6e8a4d2d9654874d61d672cb8a9dc4c18. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/FRX872279155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84ef632fb24b62712e5a8961c41b51c15d024123692c715892ef5b7258246eaf. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/FR10S2307966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf3bd8fc9b5c0e3df23d72e963ffc81918e36e1f036a80c811de84be9c526568. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/FRX202359429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa262314cb416820a26c18ee17ea0660d7744e9116f8927abb2845a005abb109e. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/FR59R2329930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf3bd8fc9b5c0e3df23d72e963ffc81918e36e1f036a80c811de84be9c526568. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/FRX202359429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec66ab26c4c8f3e2b18b0b1d2fa8f4c1ef148d694a0824f89a140beba7bec10a. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/FRX762363954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cb7072535bcc5966de9e1837410bd3579a2df46f76381ab25e6d59c9e3e7125. 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/DGA082353538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb674dc4a9d67af5b932abc4901e504d71676cb21b6a956416368bf75e6579a45. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/FR2X42462902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa96838cc65bf769f44b61a050c712bbe7486f979e3041433d1a5b35a7f0a35af. 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/FR96X2453588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd814a65490582bd1c6f965010afb6f1e627ba640519a5944d91ee49357e7d5b9. 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/DGA082413260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x652b482b80040d1ab8e98a125fa7ddc5c087876330adcc61d3727919573e920a. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/DGA0Q2488059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbf6707785036f3de291b5f7b6bcd09160d47cf589166a79c1c17b1f1bc34818. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/FR96X2563582.