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 0x61b5da5ab0559c729460de43a13de652918c962917bbed6a7e23d67e5bea5908. Chain 2 (Bitcoin): anchored in block 953717 (2026-06-15T01:05:33Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/86a88a6e-4408-4684-8537-3d2021d1dbfb.json and https://artists.proofprofile.net/proofs/artist/86a88a6e-4408-4684-8537-3d2021d1dbfb.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 0x3df9b64e2586a8beca593cc75281e79d86d3fd48cd3539fac47f82a855ff3fb2. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), 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/ES18B1902398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaed2b4063b1a10f6d59d6270a28c751cdb933e033faeee0c4d83b6fab430d45a. 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/ES18B1902399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbde7b9f15d03c2fd98fbc1b5dc6d1fa838d29ae180f35ac934b5cd62899105da. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/ES18B1902400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf99924d581cdc79604908d82695bb33b0b059aaf310a3b08306cdbdcedad82d0. 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/ES18B1902401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x532074bf8867592afa3e47e77967b471388d70b82f57934adb8b4a1b1d618ed1. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/ES18B1902404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b35c5e50849734232b8e33ad697ab061f6eae2d637fcab627acd23d204d3ada. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/ES18B1902406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66b87b731bc4d1f2758f4d1959d5950758d0b43f4ddeef70a5830f31b9a90685. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/PYE762100112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1a86774e551260dee0ab13d0499dcdd91a3ebcd5f5bc848b1e2568aeababdca. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/PYE762100111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x480832186785010a976c919a0b56eeb014f7755b975500aa06779f3cf430668a. 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/PYE762100490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x713351d5f0e90056222701c00af5d9c04175c73e90dcdccdd7ddc57f43658e60. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/PYE762100114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e7d4aebdb3cf7faf7cb02675fabdfd97d048d03333ecf2085a70047893dfbf4. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/PYE762100113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87b703fb634ba77f2a3f562dd75c8fe94e54716cffb01902148d6517aa483f80. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/PYE762100253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedf22b2a4e17887d08426e493a60480ef3e6a606582062f9c0f39b6e36f722b6. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/PYE762100461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d45383d6bdc7934dc15b6d7643935e2674d2644b77fff0866abc76ff8ee5ce0. 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/USCGH2135719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92fb3b420752c06471ec875e1cbb91de1683e2f951a5344a01bd990d50864de6. 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/PYE762100116.