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 0xa2a09efcb280d62f457991b160db857001e4a36e8fde426137d48b8d0d2fbd7f. 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/11108eb1-ecd8-4581-9832-5dd0797e8b61.json and https://artists.proofprofile.net/proofs/artist/11108eb1-ecd8-4581-9832-5dd0797e8b61.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 0x1eeed571b0400564bcd7e4342385a54cfcda5b2d894647a266dee64eb1d36bb1. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZMEM2105133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x814413c1ee5e2febd0953f1d089fce2f86f35fad9e59b10c98b510056bf34d36. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZES92295084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4303a7f4049e0912b29ce9ed0ed551030fbdb594b41018c5ce5c89287715c076. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZK6K2228728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29c441b8fa74962ac424e20266edaa81fc7e832d57e74216295dbac088a9f0ac. 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/QZK6K2228730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e48f7540d8d5844c66d7e99854e5eb81f129d4b86b913ca8a3cf2ac3c67b43. 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/QZK6K2228738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a3cd6478218cc432b54fd080b863fd5e137b9c8a76a7512ef47d8ab6a39f932. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/BGAAX2300092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a5128684e9354f4b45b92af4d2662e39dcebfa9205114f00220011a2e53f2c7. 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/BGAAX2300098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb836e60b0baac2c478e18b9061861d036acc85936282d446e3978cea09f7d966. 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/FR96X2343525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49a88c937ea2d7e388d615069fec5a060409cb35afeaa82369e4b22aaa8f4bea. 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/BGAAX2300151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba9c6fd1240f2192058ebf8ae0455d20dd91997d255c493d3d1a93fc8ee31e55. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/BGAAX2300373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4215d9a4a03f477dbd8849776eb4b3f31ed2588f6d0240715b15f8e9c28d4cea. 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/BGAAX2300407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f3be092a1542c39839f7aff14ab5eda8e873aa3207ac5a22f38b2170f67bfca. 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/BGAAX2300711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41ddd096a0c42b6a12687b95661f5269b390fd6e1450f0a477797b77e602e4be. 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/BGAAX2300785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x302291064e10f3788c9fc66cfe10e59133b5a048dec30af303dbdec692e7b23c. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/BGAAX2300786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe90ab29df3072a3a386b3d62ed0c063a1255ea2b3fb8bc14daf9f5008ac2739a. 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/BGAAX2300787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f348f4d54fe7196bf18d892c168c8c8dfeb95534d2f0c807b33b061b16297ce. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/BGAAX2300788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf6380e144beb559d235f612dc8e488e86ddfa8903be37c504b66368f9c7bcb3. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/BGAAX2300792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d07fd3572777c987fd76f099baf3cfdc269fdf0b24d4d47f8c57b243d678c09. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/BGAAX2300906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe80d8c57691d3191173aa1fb48bdbc843af64ec55ce83333d62daacd2aec3729. 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/BGAAX2500066.