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 0x8073c14a0e43efd8480a6b576822185cd25bd57c4c6efab13e66afa6a3afde16. 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/ec477697-f6db-493e-a47b-9a2dee5c4d36.json and https://artists.proofprofile.net/proofs/artist/ec477697-f6db-493e-a47b-9a2dee5c4d36.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 0x64cc9594f131c5d89b03c4c5eefb785d7f7a5674c52843e900ba919c16c9184b. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/UK6821728903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc3222e29285888a4d3257ccd55851bc5768f3ca9cd48a49d731a414d650dff. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/UK6821728927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cfc7437755f462685d382b96b2d19818e8bebe3f934df6ce496cd793890d278. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/UK6821728857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ebac7f646ca4fb55cfa43b9cb8555bfa94cbc3bbece211c56ea39961e9f8843. Chain 2 (Bitcoin): anchored in block 958827 (2026-07-20T05:07:11Z), 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/UK6821728895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x489a65b08d85a7ae556d3443a85ab60bb5f7580d1846a2a32fb0f464c802fe2e. 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/UK6821728877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f6c346cd1bd64d802c7ab27ce0e2f74b405f7108474383da0517e06898c3def. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/UK6821728888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ac87543b688a815e8144851125f44adec1d07f35b7344dff06c5ffc07251d9. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/UK6821728908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8664009a4bb5df8a33b30206706bf507643bf7001d103331708eac68fb51fad2. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/UK6821728934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c557ca30db9cdeb85eec5d1a2130284d2cabef84b8fb9a8c1ffbda494ee834e. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/UK6821816219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42ee81bf2a49c6b93cbde35f268f77b453d0fccb33c7100ae1aadeb4a56912dd. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/UK6821816236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf44c91d73377e976abdce6718adc3070d79c025fbf9c406f0c456c8a138e7b. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/UK6821819041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1254caf671efa8687c93b76da3366aee0b516ede84fbb91390ab2133e6f46dd5. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/UK6821819042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa7ad1f0cabed77e6a907f5cb8b5cd837b582144fd77e7ca244ec80f8788010. 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/UK6821820939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x426dbb555bcbfb0b044f19f7ebc44c9b9c0434f809f673e9225c2dbba95e9a6c. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/UK6821820286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x313bbe5aa369613d7c7ef362491aaad2ac12f02eb3e1ede353699d14be0c69ac. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/UK6821728885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5efd22fbb3d5f61c54359e946c4d0b22729a57bca121cc1e2e52b24bc31a0f64. 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/UK6821728887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4590cacbee2cdc0d1385d69bf1652bddcc13a190bcb09c641b6f4af1f8a77e6. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/UK6821728923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadbdc63cd4d3bb43e17cc883c9d3802f1c8ec76c1b44108162fac93eb0921cb9. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/UK6821728911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3752939825a3e1c80298cd247757b63a68495b84120138e227da949bc4e1ac29. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/UK6821728930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b075a913243073bd765d3fff66cfc1d06063ad125406602cfc605bde0740145. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/UK6821728909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa04959fc4a853d949c021a82a36373365e58b5db56f12e3adcec47ac21dbb638. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/UK6821728854.