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 0x30e6861dc767720628ffe0fb963c0dd30f6355e3782fd69b963c958fb89d62a9. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/91f58f14-f295-48ef-8474-d379686f440c.json and https://artists.proofprofile.net/proofs/artist/91f58f14-f295-48ef-8474-d379686f440c.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 0x1fd1cb464f95c51e09b3dd3b5249b48fba1547b7918a6f6d142687429edd30a1. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/USL4Q2148939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb2b2af0621ce75090cda1199fd7f6d63f5cee97a8e767fcf343b816243bec4d. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/USL4Q2148940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb50821c3152f5157f5a4ebcb5f5fe351f48b84836f766aa40ca85744728a6229. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/USL4Q2148941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93d740a2e7f80c37b1679247f9fa41ec61f5ec621fe5b15a619848666e8494d8. 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/USL4Q2148942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74687ce96937979285edf19f23332e43cc1445d2d0b8704c7b1850725eadf72b. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/USL4Q2148943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x984077d5d6816ae4a75e60dd95fadb904b0e90988e59220228f6d70045c5246e. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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/USL4Q2148945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac7d16b4de755d3d86025cae8e1e678cce74e3908bcaa430ef2ed5d7bca43c0. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/USL4Q2148946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa951025a5b0c0c6e1095ef9f08274f0875fa1e0c0e2597c79b8c9fb42d9b13d6. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/USL4Q2148947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc41ab0fcf30ed9758a59e1b7eeafcc553124292883db71cc4bd9590510e3d263. 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/USL4Q2148949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbb6d9a4ca4a22bdd82217318d90df6c0ffbbc6e87631f8c307eb9a540c4c392. 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/CBCLW2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80a3fa70db62b15cf3786ad879f136c5a3c635e77b7d93dcb2f44d059cdf74c. 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/CBCLW2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x683407253a15c8a5b8611ddbf31809fb78d480cefe53a0236e4126df770c7342. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/CBCLW2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x465569dc32ba02ab0f97e708232214214c7490c129f4290481214ec1e233863a. 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/CBCLW2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89afcfda3d8d1d3d0ee199a49c8c6372df87c9e421edea202a4720cca30d9cb0. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/CBCLW2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf35b850652a5b138b0bbbd188cc235d485882474ff8091eb226aa9a3a6ee59e. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/CBCLW2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb85f0bbc746146d297b299fd4b1d11853a00f78f2bd3f62aaed21f53e7a1a45d. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/CBCLW2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea44ec81d870a2dd64b4794426fb7127a70467ff8b349b2fa989ed43c6a0c72f. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/CBCLW2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff2edbdaee42b52fc9e0f7e791cc2310f9cdb86df6706c0f5e14caaca85ace24. 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/CBCLW2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9879a641c9b685075119623b02c61324bbf3f256b0cfd9cdd33ba461b331107. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/CBCLW2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b56d704a782bfb940ee189fdd8a8218c84dc3eaa43fd5f49606f011f6720b9e. 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/CA06E1700603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45a7a20f69a8faa16f08e88bafc940afd09a66f3070c863329f47f0768452c71. 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/CA06E1700606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84f137f0cd2ac0f0e69f74a91b23645bc64e3e57a331a3fccefb408f110bc4af. 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/CA06E1700608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76b5d146ad654a16f0ee7981f4b0df79303f67cf53967f47e2fe0da4302b3782. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/USDY42045698.