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 0xa71d9767fef46ee86bc4d476b4363c238e8e870a67e78a5fec1863eae633db8d. 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/3e05b490-d4e8-43e2-bbe5-1888eeb96d50.json and https://artists.proofprofile.net/proofs/artist/3e05b490-d4e8-43e2-bbe5-1888eeb96d50.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 0xf9b711c71f41d419fe1b9363e0380c3909c16ebc6832fa43706c48cb68d3e139. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:43:28Z), 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/FR0Z50022064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb23a0208a8a74b25345f8bb9032114d106699e886be4a47c6b74b259a9d6162e. 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/FR0Z50022067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7e62b88810af61281c0079189f370817c15a09255ad22e1167b009bbf91d5e7. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T23:26:51Z), 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/FR0Z50022071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd90b7843c5bd5cec1cc3dcebbc1d8df957a3b41e68fc5eed65746f99ff5ad6b5. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/FR0Z50022072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3516242637e12457a6e638b3d167983162d24ff1db10e92ec858eba3ac5bc58e. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T21:10:30Z), 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/FR0Z50022074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x207aa4118cab3464b2fe10e40132670091ecaf4241ce965fc1bfc8125dd59621. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FR0Z50022076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d4896fba3ca74b98f8c0d1f3cb63d73c23701c853673d71738320b8d0e349dd. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:35:47Z), 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/FR0Z50022286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e47f598e2d8af4cf044c3cd94127228dbac358de9975abcbd73a670c4cae2b3. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/FR0Z50022275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8766356b949bf86d73fe8ebcc8186a42ad59621bd9a2817695b8eea496a47f1. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-17T01:02:02Z), 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/FR0Z50022279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8adb86031d3b7c7b530ca1ec1f2f9b524c4d0caf26f306a0ad1e866cd9312a9b. 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/FR0Z50022281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82aa06608c483b4fbc8143d011aeffac9b36dca51e4b4516b9e32b6b7b31db66. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:26:29Z), 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/FR0Z50022285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8206c9ee13cfcfd79ea01ff54c01d4b51265e3627c235aa95aafc65fd73c283e. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/FRW571725002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf962a59c46d8cfe81cbb24925fbe5b5d7946cbbdc37c45a90024d0ae5d86633f. 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/FRW571725003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7e0fdd2fd4be058a0f6c9e41bde7519a634eedbbbf390a4227bcc24ed222c8b. Chain 2 (Bitcoin): anchored in block 959013 (2026-07-21T13:39:11Z), 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/FRW571725004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4284c80ea768cbbc5ae415b434744cead3f60d4c95e1cd8e9678276f6e66c328. 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/FRW571725010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92f3c3e64bcefd7765bd40b6d739a92d34f62df9553d9d6e50149488c783aa2. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T09:10:38Z), 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/FRW571725013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd873f44e4eb2ab9546c7759b6d2523315085328f3297702e2e45822e14c1ba2a. 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/FRPGB2113980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47311d88195d94b3c1d7a97dee85ebaf323073d85368358c3f4ea91bc2f849d5. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-22T01:28:20Z), 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/FRPGB2115730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ace0571f490da7ee63a1b0936bf94c0c4406cd24e61187d6bb360859e117858. 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/FRPGB2115900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6af9118c3759e5834e1d2bf75e27f79c1a7208011267ae6f50d72129d499da3. 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/FRPGB2116790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2be94fd77ac88da3383279a8ba5a79ad31f5bf148736824b26b2eaf96fd427d. 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/FR9W12500307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2116f0d904e7ef42f4da6d334c5dfa0b77d301736a84b7ab7869ca45657fa91b. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:26:31Z), 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/FRPGB2430490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x835e6e3ffd7d9188d18c1bd549fbe9cfbcc2c56c8b2e11f66dfeb6cd1c818912. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/FR9W12500301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd798d3047c338f184332d819014a94a73b38b3510f11ad8079607b58e8ee9478. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/FR9W12500302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf46ae54fa6742c3f2bcb42af92275ca2540645eb4be41d98f23abbbdaf5d347b. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/FR9W12500300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x238bb4a7203563aad0e84669c2ed6a9c077de43f5fd560cdbab4c47f30a617d0. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/FR9W12500305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0be68649de2ebb94ae5f23748896fad11025df66a32e6ec04d708cfe01a1c78. 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/FRP621422200.