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 0xd71c12f1317029c5bf5cc510faa11f1df4dae17112ab243ca9d84d81070afcbf. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c5a3a24f-fac0-439f-b184-209978492697.json and https://artists.proofprofile.net/proofs/artist/c5a3a24f-fac0-439f-b184-209978492697.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 0xd793775c07831e1666b123a37f83c8ae24473f14c9d3ef602a1992795cde7c8a. 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/UYB142319601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd793775c07831e1666b123a37f83c8ae24473f14c9d3ef602a1992795cde7c8a. 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/UYB142319601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d0974bb2a6de49beb95f41f22be47ed6123e462d2aa0af569269340d563918f. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/UYB142319604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15555084878def7045cc05b64c54f7d874b0c366d63e01bd4905682a1e53a85a. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/UYB142319603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc159112ed4204c6f78912f1de6a031466f323ffc4a5ad5320571b6c7e263850. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/UYB142319605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80cedb1b6700ce405dac41a1f3af6338629564fb302cc1d3f1b805f2e92f0f2d. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/UYB142319606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c046b3b59224540726ada59b96cf01e0151bfbc86066bfcdb1d6914953d911c. 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/UYB142319602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae1a16a85037d12bd7a9f8ea57219f709594cd2796b6a6a93892f4f48c421e04. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/UYB142319607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63f02fa9538bc0074e6aa984dcf2c6dd036148fa72c427411ff73a17767612eb. 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/UYB142410603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6386c276ec12e0e25ed6ca9f0b4d4107c0b04258ccee91d0b9fe794afd37bd9. 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/UYB142510102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x155327546e8a234f1393e690977dddbb7394f233d18006f3e8e3918ded775eee. 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/UYB142510103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb018962e4870013bff71225b531da477721eb6464ffcd4f909d2d045a93d7f5d. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/UYB142224602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46c1515c45993a830709e056a4dfdf60a4e1d40bb084e3c8e17d4c28f39a968f. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/UYB141723206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafe837ee338c4d3a06e2529f6751c71680c5bba1173f4657bc16fc56ba65254d. 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/UYB141723205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb297ae2fa699e82ec5c54c9c959339536868efaa955632da49e8d9d74e189aa4. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/UYB141723208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c645761eb23aa582c8ddb30b1eb8943c5bd99096fce7ed23dd89eb29cde5de. 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/UYB141723201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dcf92bca9835341edd9511c3cfe9b61d8b15a3056194224bda1f5f31e531f79. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/UYB141723207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf7659ad18fa7cef16b9e2872e24a6adebeca55c17829630679cd00cf277a0b9. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/UYB141723211.