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 0x5a030822aee81995bbde58f0543ef80432f38a28c5630dd7bcb09414a86978ca. 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/a5a0e45f-157d-4feb-b12e-841c3a083eef.json and https://artists.proofprofile.net/proofs/artist/a5a0e45f-157d-4feb-b12e-841c3a083eef.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 0xe4a754dbcc1276d6fd6bf0a729c19995bba994b4dd354c434f6e536eb55d5532. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/DEZ901200154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ab8984742009e6c9a9e71f7f46b15358bc0bc00d226882e00965b81c64a43fa. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/DEZ901200156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ba3fd7ce779a1af05f77277dd2c228cae75fe8f251dc723efc6ef8759b27329. 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/DEZ901200157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce1ea0c9534b2076c3c0668a1a88b8eb034889dbfcd25abf0d7c748c4049a4d1. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/DEZ901200159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c2893f19231e3ef56a43e8fed078d96cdcc496fd93e4f9190b2f8fd25af3de9. Chain 2 (Bitcoin): anchored in block 957558 (2026-07-11T11:36:38Z), 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/DEZ901200161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3127d5cb6c947696787fb584fdd35270b81d43f0f76ec681d377fcb8fcc472bb. 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/DEZ901200162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed422e80abdae7ab2dfc8d90b0da60e3fda0d83f5215570bd98c19f3a76ed3c9. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DEZ901300651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95e3de969899ab3155189978a3c1f355a23897a40e32e27500965d34be8bd174. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/DEZ901300654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a210fd48b73a7356961f34ddb6b8633e811f169083ef0ffa48564b401942a1c. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/DEZ901300658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1f2a86b5abc50ec9ba8f6178e3f256d34f482fc08a06b998d0b24b63a5aa55c. 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/DEDS30700320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f759529bc9559457d08cc8ae0a35afd1ffebf45d9dc7e7e8efd9a9fcdef48cc. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DEPI82010428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d5de324488c790b9620352fdeb42200bca66290952f8d5f48a2c5eb5cb8d58. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DEPI82010429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1366b8504f655b13830254ec54499b188befe3ad88af272ae45fadc88bb7ff06. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DEPI82010430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe65d5193f4dd5a4bec4f71986fae0d1fba2a288b9ebd1e1da29ed454cccb3e4a. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/DEPI82010435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63bf20df47f2ef76086bee4f85053d21bbd975d83108125f50f24d15211cbe80. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/DEPI82103375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c0a3718d3412aa563fecc7efd2bd0eae9ed64cf26b5ac0555daa36f11046096. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/DEPI82208237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x493f5eed90e9624c2424fb35faa6ac8e4b10dba3ac29319a0f60b91b4b26e2ae. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/DEPI82215198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabdb3596c31592c4c332b73f320b0204826eb9afeb5da7822be041ffa0bb075b. 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/DEPI82414933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1bc83c648652755992a1c7596b594c24f800e8eb5c5d9db250e342e4c30c410. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/DEPI82401670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c0a3718d3412aa563fecc7efd2bd0eae9ed64cf26b5ac0555daa36f11046096. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/DEPI82208237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef26214d2e29293f9f5f3f3b6e7f284526a4e7416ccab476d7b784b887e03cb. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/DEPI82402620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a656ce11522d01c0ce4eafa8d5aa023f0968e8f653311c31e325a25b1f8f35. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/DEPI82210650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e8108fdfcccd88795980442d31d0f71657a7e9f7653fe9f224d778aa5247dc8. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/DEPI82501472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b783d6901242b8c6999cc1aa2c188df8e8b67b0b781fddec6442ca948b71c1. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/DEPI82502134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb0ace3d8cec6f36f88142b3b40593a92ea0a41fe640dd6ff9f599e877a0c91f. 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/DEPI82020203.