thumb|upright=1.3|Skyline of Lower Manhattan in 2021. The term "Skyline" was first used for New York City in 1896. A skyline is the outline or shape viewed near the horizon. It can be created by a cit
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 0xbfc82ceb5a10b1f5e3ad03830b2b827c8c4be790a1592e3960b6dea1e2cf9759. 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/e3f3344c-d7cf-4de9-925e-084fb5004f87.json and https://artists.proofprofile.net/proofs/artist/e3f3344c-d7cf-4de9-925e-084fb5004f87.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 0x80f47a8be8cc9fdc2bc3df82538951cdccbddf2b00a9ba4a47d88dd8476ecb92. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/CZB650600105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa50ba675fc35eab141f6ed4951fdd8fd5a0e729216cfb4ef26ab9ffcb5a35c03. 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/CZA382202203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f72115e93adc489ef4c62d7eb78861bb15b01b5a9449fc4a4ad52876f1b2f81. 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/FR6V82358371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9d58835626d82f8d5c52e43372527c41fd1f725c774b4bb074755b1ad494ce4. 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/FR6V82358373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b345efaef557df973235b03675f8ab21bccf5e8c5cb77ed909f08f0e8a0d73c. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/FR6V82358374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b0ee3542bc1560edd209cce105ea7c366af892713efda582a442814d2fca02c. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/FR6V82358376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xced6d4d5229269c464b880003fe6dcb85991cd5b4402d9e6d23a5d4eb5985518. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/FR6V82358380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdc3a97ea84c287122f7bfade8d9cb17b4d7d40932b7eb325871edba988c9e55. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/FR6V82358381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60216f7d7bb7a0cf88898ca73158e59a877763419c4f9086d90021a7148c117f. 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/CZH441601124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99e12fe0474d3eb2cf2f2773ccd9aba456130c623aa11c649b3868134189a478. 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/CZH441601126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76046866d9d2cea1f77d01529693b340c33672faf05c7d6a02e129bd567fb61b. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/CZH441601129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3e978741a51e571df91ae70909485598c1f6b5fd940bea686bf938e98f2350b. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/CZH441601130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ac0a9b9e5858daa65df326a21d27ea9d1e0ae9ccdfa45522cad09d57e38c678. 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/CZH442000124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x729ff5fe77241058d2e9e4d4963e361bfa3aafa2e2978c0c0ed42e28a8394a2e. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/CZH441800023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23100541945dce7592426e63e360e961a45881eeaba10fc9146e6a36a635dce2. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/CZH442000127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54b8a6d0b33383750161ec5480d199f22a2faf9cdffbcef56b9f5dca89d4a9bf. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/CZH442000103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47b8eabf207a5b93d732f42f3c305e5edd6ee521aaaac7eb749606b95a07f26d. Chain 2 (Bitcoin): anchored in block 958828 (2026-07-20T05:21:06Z), 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/CZH441800109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf006d7b46faf263d6baeca5850e3b60b23248f65fb3f8b9f2ee66dea0e4e6d26. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/CZH442400034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21533349ec4df69b08b7e97ef6587a7e24a9871f36a718ce379616a95e967f5e. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/CZH442400077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x257ae5ee9b6d263df5038bc06a862bae4d0baa8ebbecb64811d582b4ffd4e84d. 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/CZH442400078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed91d8ae1575e62ae7845b28d2a1b1c36de19bd62a92d879f729340ed6fc38da. 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/CZH442400068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf006d7b46faf263d6baeca5850e3b60b23248f65fb3f8b9f2ee66dea0e4e6d26. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/CZH442400034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93db9d0a1c253fb8e51aec2c96619efff7ed9a253b527fd3240cd35e5d63ee0d. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/CZH442400079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9198811baba994aa0d3afdc832ac121ec5b4d90b352fb6c204cd372596a10d56. 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/CZH442400080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc46ed529339beec98c374fe08293b4e6af60c1f9a8f3146ad56dea1908f484de. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/CZH442400081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1c1666fe62a86ea00069f3dd0bdf22b07f64cb07c1454534e1395da4389277c. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/CZH442300022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00da46e04cd08e296ab0bff6fa4e12cc59b2871efff6502df17d08dbe511d388. 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/CZH442300113.