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 0x8f7da035a48fb22cb8a46e4312e1d64471652f8391c9598fc81ef0f32eb2981a. 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/5697d1f3-a61f-4b8a-9fdf-adce152a7be8.json and https://artists.proofprofile.net/proofs/artist/5697d1f3-a61f-4b8a-9fdf-adce152a7be8.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 0xd9e46025204eb3100600c4e44d4b5a950afb5ce9f3d0fb9907ae7b2e3aa450f7. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZHN42152536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d32aacf95d82ff2739def9b7475f19d0572138a65b7018fda4f7ea517be0dff. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZHN42152537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad77b2a88f26ae5fab7d81735f367a6b1d32edcef3b9c14b9ff3acbc6742f410. 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/QZHN42152538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6301bc4d8e5736f98e58da143735cfaa6e0ef708febf430167a3cdff6df1db8f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZHN42152539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9284c12535101cc8c289071aae4f322d7b205ef4bd7d42d0ccb0b1ac5b8d1eb2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZHN42152540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d278704adf0921470eb9fd92bfb1735924e981753f1fc778e82bf04e756f00e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZHN42152541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3e72897e1998ddb32a2a2fd54681ea4fdc22e9c5e70fbc9495bbca7b6a1b26e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZHN42152542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x442b821d6406e4e5505b2f8986308c0bf80e30397a1a0d82af941c9b7d2ddb3b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZHN42152543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeaa0ecfe102d28469c60abdd499f0f0384e76f28b25b3d630fbd0d53f07ac4e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZHN42152544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ec05b130d13a853282946dcfd02ad21e113823e05b024878baf00689ba88232. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNWX2410449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3d51c3cdc15e583b409c3e5b60772fd2a2c84e173ca35e52ff47b08909e2ef5. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZMEN2457295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a6a522bbad77eec3b02b6cd3ffde9aa425fcf4201273183db075008b8d5cf70. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZRP52466981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640855838f9e934bdbcf53a209bc02a2f8ac1939b5cc9fe48a975e295e552082. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTAT2451821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3341978c08a3ac011153db4482fe55fa1f05225848e826bd31693033102de9d8. 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/QZTB32264852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7a26fe2a8688cb8cb7cfa6efacf22501f11aa754cf798231994dbb422e657c3. 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/QZNWT2182712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2597b3bfec1a2bb8e8772f6ede3532d4486ce3895c22549ebf4c6e1f187c514e. 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/QZNWQ2145968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x667b78a27fb30874c32eb6f81c1050b6c2c6e1b8fa7ae195aa44ef6e3d915215. 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/QZK6G2139452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5c2fb1d2086008705666366b1e132275d0a97bb227460630ce4b8c32e33bddd. 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/QZK6N2163722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31bf275fb28c927d3fbb7f48e19977885c38bec4bb41ebcfc54f440a986f3674. 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/QZK6N2161667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7a48463aa248b3bcd1089b5431b195ea09c92d5e42a7954803bb7055517dc74. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZK6P2186175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcea3515c0a905bbe5b99e825b48aeea22e47ce066f74a1780d138de634c3929. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZK6F2034889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef2021da3dd67e2d95b8b0c891ef0108078434cc0097ffb43b2a2eeb818d970b. 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/QZK6H2061326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6c6d3e48a55d9d32e758e11cf5ec84cea35f1791512cc1a86977123edb79bdf. 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/QZES52030021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaef743d3c40f84d02b808d8fcbdf70435aeb46636ee53fde8ec592bac19ee6e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZFZ22075340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86db24f4e1438f2cf8d15761a49fb033bed1d2efb3e82441dd35e5c35b3300c3. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM24S1927232.