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 0x81f7828aabefedeee3d944d285c861ea19dc36832c1eda04afbeb0357b825b77. 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/aa298482-f18a-44d5-9caf-97a3d3727ee1.json and https://artists.proofprofile.net/proofs/artist/aa298482-f18a-44d5-9caf-97a3d3727ee1.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 0xa57184b48a2f9fface7f248df1ff644fc4fe25f793c67c3e38fc9665f251d0d3. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T08:28:13Z), 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/CAQ520402004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e7dc4a8d6d059adcb60be36e53324b7a8f66229263b545a36256d934897db61. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T12:56:59Z), 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/CAQ520402005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed67ee0eff821ca4194408a0b41702e4b6f075f0dafd3ae17195072a031405e6. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:27:00Z), 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/CAQ520402006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5ed5d191414ea7dc0e29ff39b39734f8e75383ddec28cf0027fc7578a6aa3b1. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T09:59:01Z), 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/CAQ520402007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc5b58907f5318ecc24c7af98e41d15288a6a87e9b1751eb32f726e8c3d4fc09. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:46:17Z), 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/CAQ520402010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x504ac3b84a0fdd9e4f6a7cfbf53c43bd926de6b48db42b6339044747b3bb0a24. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/CAQ520402012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71b34592185e9884a9bcda51404193aac9c544ace80c91712f0a3d67ec603229. 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/CAQ520402016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb21a79bff13e6fb437d9feaad6920483f346b5bc45ac28818a91ec222805c71c. 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/CAQ520758201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1b220d42655b9e4d8961625fd1184c8e0da5b5d22b2d2c41bcbd5eb08cd2ebf. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/CAQ520800149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xada72f68e601060d3ba7fd45dfaa51f69113329f0bdc46bb485584c7b25f5e60. 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/CAQ520800150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1578d29f43d80a78c5695a936bb976e693fdcd17a673a98f2b2328d50c813af9. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CAQ520800151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dd6a9b08a0e630232e58c2c9c58a4ce88144bc7558f45e8b7d77c11ea51bd52. 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/CAQ520800154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadf7b00c4be5e6070aac8b2c4ea1fe9f3f6d28fe3a17da655f55267d3373f988. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CAQ520800157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba23a76bff51fd6eb2fb05a62bb0037fafc2462e041c1c8bc1905a85ea382c9f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CAQ520800158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4a653fe297373ee060ca0b4ab1b8c278c1631a5541042e274cfe42d61b0ed5d. 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/CAQ521362401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c02f18d071e6cbce798fe39ac362a1373d9b8b65abdd0dcf68c6a90ff8fe666. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/CAUA11500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x743c36f007d2690364b927c87b79eef8dc95313a2e29f5e3ed99d2512041cb64. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/CAUA11500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x589c4916b87044aa67b7061a13ea9ee31d9860c6341fff92bf3003a9e24f75d4. 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/CACAO2500122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a1ad803f814fe145ee72c0b4b3b05dfa13698576a25217f5f7ffceca08adfb0. 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/CAQ521096019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e33ceaeed01a1ce45a07a3485a30e182ec7e0f6d2b7451b0e98628ec38864a2. 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/CAQ522046002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc026face97dd6172b84e2f0af2a66a0a10dc1087291f134cc96d917c49b6efc6. 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/CAD940981806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3338b61f2a46045d049c346bdcda56acb39a1cc0f084ace17f2ecaf9f6a05485. 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/CAQ521096011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c78ae83d03b2345c5605dbe7d06b7c9f2ee1b8e4c0978dbafbcf7a87ddfe88b. 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/CAZ600300030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x905d55d29273941d6751dd408888212eadad8da655c066627e63601f980a27e1. 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/CAQ561212003.