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 0x35360ef2863e66c5fbbb6975065030b6bf3a51a77ddb4d58789aca14118acc2e. Chain 2 (Bitcoin): anchored in block 953687 (2026-06-14T20:19:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6748883b-a314-4f7b-9269-c266a75ad3bc.json and https://artists.proofprofile.net/proofs/artist/6748883b-a314-4f7b-9269-c266a75ad3bc.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 0x2bfbe231d2407fae6c064b15422709560bbdf8519f93aed2ac99cdcd5a4cbca6. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/SE6A91992366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b6dafe062a4ed11e0d5171e60d38f0cd0d03a1f08db573d4a43d911b2fa70b9. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/SE6A91992367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91421841e2a71830962d10a0ca0b099e1144e0430cff238ef4920250ced8e6ff. 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/SE6A91992368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f30261d6690fba6e90b58f6be3ffb99640c19550be35fe52cf7b44634fee272. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/RUA1H2003781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6745139286e568719235b87967623e4d0ed80567f63beb5f17554659a606b27. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/RUA1H2003782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a44eaa1f68825f1f07c9798d0a99d6a5adea4d56d675cb9ee598a99efc5c514. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/RUA1H2003783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd06858501cafbe3a3b702ed2956770dea72188413e154792fa4b5982b19b5245. 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/NL4NL2167620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0330e4d1c04d97f15403395b8f952ab2ef53246afb034dc2540118c7bb2d8eb3. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/NL4NL2167618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73cd544c26f44cd4dbe6f7d24feee09dd246409759351a18287d26b4a6a1c9f1. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/NL4NL2167619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f0dcec02e198c47bd1075cab2103fff22669e5a869cf39074b12bc4f174d515. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/CH6542330853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6e6047246d7dc8b20ae7cce6cd5260eee121e9b3d663e7bc5c09319cfe65d7f. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/CH6542330854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc14c05432d625fd2724a9edc2f4fd17b63248072f6e608bd5f5932218c754203. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/CH6542330855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4f29f82cf78499af715c641bdda45ae64ad9727a7573f0e282c51d7a606aa59. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/CH6542330856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e5f4efd17d76fcf7fe1b628a857f416e30f67b8162641f7cca6f34672c7af2. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CH6542330857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf351d979aa4352b542d89dcc99f936616482069ba42794c7b27f965308a5ac57. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZMEN2462102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd21060df87988d4718a2c85dce6c962cccfcd0cf0914beb8237aa4ff2c795c4a. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZZ782496997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb52db35168b54f6ec8ef02a37bf027ad149de58f001c4f6477a498abad8e35. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZZ782496998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43affdfa87c2e6c3684c246003974fa8c7768d93dcc591741dbecb3fb0c1a4d7. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZZ782496999.