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 0x52839abb01023061d33fb62c7aff51842fd451f463c365aa8c4d2071f1d7b83e. 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/e4e12340-4509-4a0f-857c-648a5884f225.json and https://artists.proofprofile.net/proofs/artist/e4e12340-4509-4a0f-857c-648a5884f225.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 0x6541bd9e1845c61927e244f9af36026c4d1f90a067221a2878f43933211533cf. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZWFF2479285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1f1d362a8b958ecfcfe25c9c72f0b6e59622a1ec41d2e1a6c3f11e881305661. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/QZWFF2479281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca4fd3cb0839f6aa3e36a839d425b9e17dcc7c9aa36ef62d5641063a12c43f8f. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/QZWFF2479257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa71ea966fc7ac26d51b8fb8ef937aa4ac7f15d1ad9e61a010eeeed15239976c8. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/QZWFF2479287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9278cb20604110c24be9eaebdd15d1407a9819aa53e12d88c0cbfdaa14df849. 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/QZWFF2479274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x533844d22433a91fb00f4ca7c9c1d1eda14fab37dc734d14dd683ce39ce7e8c8. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/QZWFF2479265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d50d36fd1d02957d52c31ffbca7e4fec2753120da60aec855dab931d8ae30a3. 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/QZWFF2479260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9086123abcb1427193c5f97abe130c4123930d0b56a5277a8361ee42a476e5d4. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZWFF2478438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaa83138f7abec678e50893284df7ffb4d85ac21c7e1496845e247d7674fd0c3. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZWFF2479249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1bd712c7cb714ceabe2da4935bfdd97216ec6f81ae7fe74df360eb6f3fda1d. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZWFF2479286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4564a4a08d84604fa611e01aab9de1177d0c75feb9d994844f14383a1c5b67b7. 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/QZWFF2478427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3019f3993362aab8012815b5cf1794965d33829c4da9a6a99a10a0a47b8e1f6. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZWFF2479261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b907fe54ecbeb341dfe1e62e8506b524642ddab6823bd138858928cd4a982ed. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/QZWFF2479283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ab98f9f2331b2bfa15cae70f02acc2c5f1d55abad3f237b54112af7cdb12b5d. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZWFF2479267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2edfa33875837461916f0973d082a944eebbf273ad2ee286e83c3ff5d149226. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/QZWFF2479273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87fa650dff89482401d6011e6602f108d0f94f12050b33bc55a9cc037331f4be. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZWFF2479258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f94c9ec92a98de624e2113d7bcd68b4033bec2ef760d70906a7b611f1fb8f50. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/QZWFF2479266.