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 0xbce462ee2e8de22a11f5af7b3c82d8b2f33ed78d5ca0a713828fec213c8eb709. 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/f6ef30e1-5e4a-4633-a1be-ccbb0603a2af.json and https://artists.proofprofile.net/proofs/artist/f6ef30e1-5e4a-4633-a1be-ccbb0603a2af.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 0xd6e472f35ee8185e9be410e895ec15ae7224b8be44af1f2f859c970fab9bfc53. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZTAY2493934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e3aa5e3e9918405e9f529abad1683e3c0d4f501410f21a9e7dfedb2f976c90. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/QZTAY2493935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x593101324d8cd68be02229f08da8fc6046e8208e8e9aee230f227fcb32ae2147. 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/QZTAY2493936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e4e51aa908c51d420f04dbcdd0142ae9af5c35a6998b326828216316d86f1c8. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/QZTAY2493939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0e084483e15363b7bbbfdbf0aea5e3d65f6f81c58f82c36523ec587d648c06e. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZTAY2493940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82ca1dfb46d071702ff2b0d12d9c8652333aa458f9c3d79ee4d86d04cc1509d1. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZTAY2493941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54f0462ca9dbe28503ee0d1da154b9cf359374e479a407379f9fec08f594cc95. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZTAY2493942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x377dc69050d7693ae9b9304f70e11bffb780215b15094e97cd5c0fc6994ab0f0. 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/QZFYX2515465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3a2170480626858b12ea837cf161d955fe0fff6f70e44e0f55ae911d1db7b2f. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZFYX2515466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c331a7a4ef329f6491d6f10737cff2d11de9a4a28a368abf303bfe753d34878. 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/QZFYX2515467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed9fba129d41bd6ac82523bf167127ea517fbbcdb385195d9aa0bf981d05fdd7. 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/QZFYX2515468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81805c8854f7215e2e6a2b069ea7d98cd863cd0d136fa32e379e693ccde8005c. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZFYX2515469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f822f9e18305640d7f009170cdaa4554e82620c9c805ad7edc29bcc9ebea090. 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/QZFYX2515470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb5d249900a1eec40aa6eb961ef5a2b7e556c31f18d2f6015b6f58799df53c0d. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/QZFYX2515471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd37ff79b54978e6bf957aabe1d37709d25fffdd9a5cd8c284a19b4bd634d480c. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/QZFYX2515472.