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 0x9c42c1681bd0482a45292650df04f938c0c965546da7c05a02ec44c7a19e36b3. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cecd4a07-bdb1-46a9-adaf-8f62bdd96b9a.json and https://artists.proofprofile.net/proofs/artist/cecd4a07-bdb1-46a9-adaf-8f62bdd96b9a.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 0x4890391f0bccc7879d0ee003cb55f1e083ba03a42ae9f2b25bad14890c38bc02. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/HKG732277853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8735ae743a14a585304f6872e017ec392236bfcb6ed6110aa1dceba02000d248. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/HKG732277857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x883f1eaf43f9583aa0df0aeaca5c9093b8166ba2b5704005c08e00446f115940. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/HKG732277859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x903963e1831bf40f6fc5aae435796c73e8c9969783613897757078d641eafa2a. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/HKG732277861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x688a7b33e322f9bd9d3c97b5af8a336fcbf643c2832b3f8ff7a0cbfa8f885015. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/HKG732277865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa830af28ee43b562138590d0cce8ff15396d892b49a50541ef57724b5b0e1ae9. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/HKG732277866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fa61b834ed7b48ebcb304d21bfb801db51c3a294908cadd04128eebc0f95f59. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/HKG732277873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3104029f3a92cab65a39566665a1a7a1a5e7c4aa8a3e7bd801df101c402586e. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/HKG732277875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7158a9ec4072a287216956c32bf96387cc91e72fe21cc9e15ea940137151480. 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/HKG731679432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27b9e0c97e929834a22264132ddabcc802b2ba2c423b50fc222a71ff4bdb0293. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/HKG732124324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb34e893fc5d4d99e07ba3b6c158daa2b31dfe1d0769546519098775195d0361f. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/HKG731679434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9e6ad47cff0df0895428f390e06244047e07ab7cfafac36d7d2dd33e9491cc0. 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/HKG731679433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddbff1aa1eac57801c8f145f6d560aab3b009aaab8aeab433b3e82e592f12808. 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/HKG732124328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9b6bac3a1d409c7672385873abd903dfb2373eb37368e5cb81b61ec81fb0a47. 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/HKG731679435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba6b5c071f8f81324f617aa576fbd4ebf4cf845265d6929ff89d553c112346a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FR59R1830575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6948e137d1baadc57ca56d3b89ff3d00765b33dfbd127682fba4d826886a1bd. 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/HKG731679319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86db7d32c8955bbeb0667ff18d694cb31673b838f609a59fad008d97d32f7fa9. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/HKG731679315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f2dc23e2f2d049bff77906bc74377f77f8014e94bb40a6128e8cab574c71b7d. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/HKG731679311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9da18b4bff7bfa6a6980701a7a5f5c8d5bc01784a7aaedd2c5a4158c09b3020. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/HKG731679312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7f7af0be60692a7ecc17b3b2ca670969b02ad0877c7e27a7460271c0ef2f229. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/HKG731679318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbbeb5b753f59bc23eec227f2caa0bd5ce1d0343a8bb89c6ade73df38020c143. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/HKG731679246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97bce6531ba46d92417bce1b1c82783814a4b133c2406be3cd2d2712962b19b6. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/HKG731679247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5d3d863293e2bb207293117242664e0d2adf4395d7e3ed02cbab0a68fcb75f9. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/HKG731679248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68a6d023f36fb0d72fcd06059767d873f0e09b47e3ef1607622f64480b4cac1d. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/HKG731679293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8b1d742d724a236fd5cc66b30145ba964926e593dea69a51f2d5a9a629427e5. 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/HKG731679292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08c9eae6cece37ce8e54127b4c48df43ba727d2bfdb2108f610264b7eeeeff41. 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/HKG731679300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca79944cc50c6f1895e78a563b918233b0cd917d057549ed7ba52ce3e7133cf5. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/HKG732236600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6802d75015cea4e2e2bd7ea0cfeb08d6b655a7b3beba372fe9758ce4ad9ee9b6. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/HKG732236602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6588222638b28826a15722cc62bbc4b8bf7e8a0fee597d0755de9ef3e4cba49. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/HKG732236607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c7b567de563e72953dadfc3dc4a7f41f1e2c5a5b1cebf73264ef70abcb39a9a. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/HKG732124360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4197a3347c2ee51fb7dc0d99a567d54c500ee7ae072e469499fa42bf901f30fc. 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/HKG732124372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x927fca39b9902606d3099aa18c9dbce7306ebf9a0f0996a5bc337033e29cbc34. 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/HKG731679323.