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 0x4458fbc0c7c5f18c672faa63f8ce368c28d001ab2d63e9d7aea65130a6d337d5. 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/a65e396f-bd30-45ff-b4cd-e745ee59bdb2.json and https://artists.proofprofile.net/proofs/artist/a65e396f-bd30-45ff-b4cd-e745ee59bdb2.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 0xc6e4a890c1441c0b8a45171d80b255c0da10f6e981e54e851a5cf52a850e987f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FRX872330935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf42b7657e4c1a98301b639e18501ac22f39fd58e83b17ec80b14db1defea125a. 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/FRX872330936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95a6ce332219a4097727f84d2b47858445d50876bf2f58c3243c37e68e78e825. 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/FRX872330937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6952a930afb8f91a65c91e4c5541a433e10e08f51b1c1c07ee264aa8969c3826. 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/FRX872330938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf798715855286ecdfff18b375fb592aec6f654e239a33f976fea8e4d6b58994. 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/FRX872330939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9e6eef03edbf8faadbf27267be0f366b4e0338d3c79a14b92f1b917d5eb7aef. 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/FRX872330940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71b0dcbd2574b8d74a6cad3ef15f7423b2c980459be3e0a92d515e1a586e738c. 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/FRX872330941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb90c74edb1d17f32536c55c6512cb5ee40979d981c570480136efd2d1b47f83. 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/FRX872330942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29d0b7cd4fdc1db00e88538adebccbced8d009c118cba387d4ffaf9382aa14fb. 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/FRX872330943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x883d0ae019d58e3eb8e97a97e64c2edfecdb67a3ffe0fcec74a2f782da039803. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/FRX872330944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f42a5e3daa9ee5535a1c2f23f89dea692b43668143d6c66b99824ef3f0b042. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/FRX872330945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x650f5ec86412a2ca3050bbadd915bf5a887d2c23a478c1d15f781e33b37e30b4. 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/FRX762333820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa56018bd3cfb34a38cf13cb998e8a88543f7f15ae10d4158a28061cd22d92f5. 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/FRX762333821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d2b0c7ee80650193f40cfd6868dec11cc7bddadd9000a84d852c94e24ab2861. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/FRX762333822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2281c271fabc2ab1342e319ba816c3ac75cd2b516a496c0efe7a81c73a70d18b. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/FRX762333823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20a5256c1cb783b47988a0cd4956da278bb1a053cf2c90fd3b1c56d87dce9f72. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/FRX762333824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e7f56236f26a8b1b18d6197fedc57fdc87b467eec1f2cee0db89fde47276b96. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/FRX762333825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f7d9f35ee8d473e24c14f93b0f7bfbcd6471c9621efd52a01f3098828870f1e. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/FRX762333826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec8264b259277ea7ec17b285dbf200f8c5fe72b788a5dd42785e9cbe5c5338ad. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/FRX762333827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2589f3fa739ad7b2cc7b1cfa46f0e7521faf649ade5125d6bd63eebabd67bc87. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/FRX762333828.