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 0xb7d28a03453d9a34f00679ec24a8ee5178c498e1f0af95651a3303702fa96581. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fa36a481-bfcf-4c73-b389-f4476dc3d513.json and https://artists.proofprofile.net/proofs/artist/fa36a481-bfcf-4c73-b389-f4476dc3d513.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 0xdb98ee1c646e61c202a53775459d28818804a440540ac3553d6868b8dcb83e2e. 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/SEVOZ2400101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d2b9c781edbb4c0f26b222c489b5e444582d274a1d66f816ff167e259219387. 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/SEVOZ2302602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4b071b9d2d1520b2c49fb641e03a6b99579637402009d4d1a0d737c5f6c47e9. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/SEVOZ2302603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6497a957d4f58ca9a3a3a595d397c6186bb4154c2b7b4016157ac5c8bbc4dd30. 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/SEVOZ2400501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50f5ab60ef0daef575bdd3b591824eb1e3d0948b5a3286a8c35aaa52bd68fdeb. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/SEVOZ2302605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7acf087c801eec67359b132ad5547ff79ae37869ed21d84d4e938d96e3d8696e. 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/SEVOZ2302606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68ab68c541eb9d3debae9f7e7b41b8415eb525e3f2c32b74c6593cd144b8e0c5. 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/SEVOZ2302607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aee6363ff4fe50b1469f26a5e4afab7adb5514e7c59e7c76b442749096d897a. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/USB8U2402221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6505c6838c1ae4b04c45001b32c18a71e12294c01d6b36b816efb726f594eb9. 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/SEVOZ2302610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdc1f8f8d22de2b7c7f0c0bca151bf729df5f4132418e5232998d8cfbd3d3e6f. 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/SEVOZ2002501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x523b5d458739f1005702a1c61ffe0a530f529d902318d6dfa093bdc81be2c156. 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/SEVOZ2002502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4fef5e4b4a3c86e3ad7276897c2428efd6f610c33743ea9abaf0f93e4f46299. 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/SEVOZ2002503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c59e2a3832acc6dd27c56b73fc0c2acec9fd3fe903847964285778cb53f998a. 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/SEVOZ2002504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf88173d55221dedf35a2574e581dd37069986bf7daa3841f90c5c65c5cdb2339. 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/SEVOZ2002505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceb3f62699f244d0f9151f5b076433ec7460341bd1ed08e8965fd3865ca6fa97. 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/SEVOZ2002506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x465ea892bcdf80d0206818aa8ac741d03aab0114d67faa940a8af6add5809196. 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/SEVOZ2002507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90b2c702bed9effb7012462cb12e496c352445935fd335d6d6e3e6c380dd8acb. 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/SEVOZ2002508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa3ab2b6369bb2bde69dbb95ade91509f17fcff76dceedae6f4ea4167b0a2b59. 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/SEVOZ2002509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x285e67ee172705e517b659b4f32591d9aa14d386e5aabbe4dc56249ccfa35844. 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/SEVOZ2002510.