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 0x7584093d4d05ba6953032d490e403d5f4f9a192e50a3befcf15a90fa48b14259. 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/9a5700a3-4633-4011-a4ed-3bb42bed5d1b.json and https://artists.proofprofile.net/proofs/artist/9a5700a3-4633-4011-a4ed-3bb42bed5d1b.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 0xd24b2e87764105a4cf62c181eff343c86966e91dedbd13752b6e94ed6b84b5c3. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/PEBQ91722218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48833099af0e23d3e11bb889a85b0b08156d8aac5426f0a0e13f0c74d8e32cb4. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZ5AB1810246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf6eb22405bf48430620a1c3e75c62604342a5cf1077a24595f31393a6b41ee4. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZ5AB1810249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x113426c54a1c3a2eb18ebf049488a64422d2177f5c1efa3eff70d9e140e2ece6. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/QZ5AB1810252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd94ca2311206d4d7c9df98bfb61b58b55982cc4b2264fd30900998e46bbdef8. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZ5AB1810253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf697b1e3667ceaae25e661f1880b5a857d87aaceba58422796e31232effb84aa. 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/US7VG1987941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe59ebd71711d756e967a6673679f58914a53f78139a7822d609871ed7305aa6. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZGLM1918360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28357c0ca0558c6d85effa0e92bcdd57cfbf4669ab368fcb186a289e5fd27dcc. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/QZGLM1995250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae0b972421398de9b7bcd4559ab85d8f1e3b454baa351b9c9e4e8a84323b3937. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZGLM1995251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa91c2fb09202a2e9c9e00fd188fa3240701de85c7b6471859162df3c8f37a2fa. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZHZ51981625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x942367be56f5e20c31a7270808e16951646fc2ec0b77e14219224ca8815cee96. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/QZHZ51918852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ac1c5f2eae4dc32028f155ab2fe3166ccf4d12c1d2719c4455098d916b45507. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/UKXN21964248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x062b17c10a7b1af1245ca57c10d2d7159e82f3f181dfa0428be9eb6dd2c9f819. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/ZZOPM2106410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c6de6342a6512193f6c1ae291d02bc49dbfb1f8c18af56cbde122bbb65d38f8. 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/ZZOPM2106411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x966f039520177b99e39ac077bd59c724d5ff29eea7e403f481a56a031ab52320. 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/ZZOPM2106412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ccd7ffa377b6cfeed244ff9bbe7420d83748c65175222bc2620368f311e8e76. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/ZZOPM2106413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x545b9a016a5c727b3b7c0301f292ae3f95dfcf1fb305a52c5cf5c1a023ddf21c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ZZOPM2106309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a352f85a9eca5a66b0d9c51b08a8409fd757dd6010685e6728fc7b846b52f33. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/MXF152201109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a352f85a9eca5a66b0d9c51b08a8409fd757dd6010685e6728fc7b846b52f33. 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/MXF152201109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84cd996e278c05940452c22e86089ce8d52c7b2af41ac551bb5cce39af133798. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/MXF152201248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf176c7cda2deb41a8c21fd8e2139ac6aea2475b8bef9bafedc2a2f249c0ef3af. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USUM72304014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7ec9744a7172f8132a324d7f664f820d6114e27ca032c127adb16242ee6145d. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/MXF152100064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73cb741c09653d7322a2d919578ff5ce1cbef1ce586bec0be9efaf7ebd020468. 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/QZHZ42222305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x067b474ce5b725526b6a1f225237c520fa741c38349dbec1a056184dcfb3ef76. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/COAF42391062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d53a95e47612895ecf4c696e82f00931e30b0591754f0ba8564bd69708d0590. 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/QZDYA1800288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa21022f8abc6be5e6a42fa2bf0e2e6037d375663959eba1c5c1f469e55aa25b2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QM6N22075437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9f7469e8295cb354924ca4c90e88ec658f2d76f28c86c501c8ef6d636263a7c. 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/MXF152100163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccbcb2652cdce997a9073112b25cc6e4d245a0a0869e77b2e251fc6fe6389ee7. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/MXUM72200314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1bc9e582ecb2cda617d222255456c5f3f82bb248bebb391f4a7018717ba6918. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/MXF152301241.