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 0x985b3158ab2574ac891924a2546394e1b86a66d57675ab1f049c61f761128ea4. 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/f6d4cca7-89f5-486c-8036-52e58295acbe.json and https://artists.proofprofile.net/proofs/artist/f6d4cca7-89f5-486c-8036-52e58295acbe.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 0xde8bf6f2048140f8c7bbfca2ba75bbe12d29483b99eb0c1ea86e6a9663ee00c5. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/TCAER2029372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e71f54cc0db2419073ccb14bd2290a72781b984dfe28aa755c20c91cad8625e. 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/TCAER2029467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bd1c7bc3579dc3df7def13e71e4d6ff4efe576bb983026e2607a777c3dfd997. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/TCAER2029472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86340c1531016e27ef9047f48d3168af5d4e7f4cab73d5c79761e9beb6f325ea. 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/TCAER2029495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d53279bda442cf1c792b37171261967e6792f755455730f0fec68892508278e. 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/TCAER2029513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b1cbf931d41934f282dd88b0d7b2afb15a0e02b01bc07efe77bdc6e1cf42f53. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/TCAER2029521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc8dc358c7ee26cd1f87972f4f52e44bf27031c122d345a83fc0db32be4aa27f. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/TCAER2029532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x928a1ce709d3536ab29a5f99ea7c1128744ca9ba540dcc3661e95f5cd6eb6d6b. 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/TCAER2029581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd019cba5ceb4acc211ba8c63f79d26b37490c1c362c195fab4b4c8807d8c93bc. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/TCAER2029598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ea1a1db7feb25156f7ef5592ef074f0e54189a1951b49de238000bc40d3435. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/TCAER2029639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ebaa0d50e3cb498087c739336215a15e34c856483a5bb0c63af3cc931a03ec9. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/TCAER2029693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eb56da5e52222356035b128cdece2bfd070e28596f405deffa5713d0deaeae3. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCAER2029697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66dbe55212fa31e201af30261a3cf0a8fd55fc3d7f654e5b06a264654d2cc3cf. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/TCAER2029700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2b32cc0eede389dc77c6d2e19094d5a1de248ad55938283742454bd1fc7a56b. 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/TCAER2029703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96398e97047a7d17efb5d889cfd53f71d9408691de8e0cc73d260aaafa365858. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/TCAER2033535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d04c2d674092d5bf44804324f2973de6d38d769e40d50cae193102f5343b22c. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/TCAER2033580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9c37f1b7e653d1b5a1d995df9f285137aa39dd59b209b0b81dff00445739964. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/TCAER2033598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc48b5aab2fab78f2a0fddf772d29027c40bb1e690b192e783c133c48cf562353. 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/TCAER2033601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43b8f3e7cec28dcac92c4bbd69f263cbb6ff5d8475067570d0f82f4fae734b5b. 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/TCAER2033636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ad02fe203cf66be5b885332a78d6a9ffb6fd8f2623f4073e3f126d64544bf39. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/TCAER2033663.