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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 0xa3dac6a8591d93efe95c78da66b689e9c5e9930d9d416b6572706c463940bf40. Chain 2 (Bitcoin): anchored in block 953783 (2026-06-15T12:24:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d68dcaf1-c3f2-4324-8c5c-c5c045d788fa.json and https://artists.proofprofile.net/proofs/artist/d68dcaf1-c3f2-4324-8c5c-c5c045d788fa.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 0x6756c38a031e32419fcb71176106b6998365f106a1af9e922c9d1911da64d755. 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/FR59R2165540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f072eac4039fbdfd25a28673aa73e2c6e9fbcad50a63e135f67d8cfd35c488a. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/PLF242208837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b21277fbf13a428a1142cdc7097c7083328545dfd399774b082d4a34cdef07. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/PLF242208895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9198afda75cd93ccf06395607f609264f57014733f1939c576cb54873f61e227. 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/PLF242209261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27808c3f3a5d59e3961ee20ae82561e093fdb27dfc96826ae786c0bb7c2a33c7. 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/PLF242209735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96bf37e970c527e9e57ae0ce52c51831b33684529b03abcb7c034d2f53d18652. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/PLF242210526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x493aed759be8cf877eef5620d2ae772024868eb0c45ce93917fe0bc7a14dc3c3. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/PLF242210537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c166e3519fe59a376c049462031603218fced73f39e2351900151ccaa6dfb4. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/PLF242210612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eaa941d00d369e713acacf954afe8ae422308203ea74ba46311feccbbb0abe9. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/PLF242210636.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57b7863020fca0e533d34ffdcf6b9ef9f99eeecea705d11aa76c762562a266a2. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/PLF242211058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa12ef0e2f18eda6849042848ac34a28e5c27732c876c17475c85a009b1639e3b. 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/PLF242211121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38d6fb82b65295f1d046406c1e1d34b9650c66034f5e5fc27c8c10e84211874d. 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/PLF242211109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb61de47d6636074a4214cdfd4f0458265153d5cebf428bcc8628b5c9b7bd625a. 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/PLI366141440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8d091fba0f0aeb5a3fa12d5e6a54815f98867ef0ab8b33ff44f38a66be6ba46. 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/PLI366141450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe76ffb4edc3dc3650a56612a0366c041d4a115368a544d38e2e45f23ba0c43b7. 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/PLI366141461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7504c0e4066df1d571e4225fc4ec9c02cce6404d084be2573847a53a89eeab24. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/PLI362980840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea8ecfd5910b0f2c8ab7f9bde72b2b829a57d6f830cefbe4b651b7ba1040b4ba. 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/PLI366141480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb02a9e099c987e723d587ce082d08d613771092a0736fd35d917d347615c6a64. 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/PLI366141490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0aa422b2ab7ed388c38e252d981504502846a132d476dc68b8d4f3580fc480c. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/PLI366141511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24aa982c6692cbb7759204b072bcf1c48cbfaac294ade59b0f9a0b1e2dda9679. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/PLI366141520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7b1c176417e1dc4e78381fa18d02de41f4c2bde6add4dab6afa3627dbd87f95. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/PLI366361881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8109d3786e9217ec0b2d79e1917b0a56edc87476c1e67e45ce6370a77c4c3c6. 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/PLI360424800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc863ae829086973fe8dcfa676026a172868e15dbb9219cea0099a13f65aba83d. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/PLI363229280.