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 0xafba78fc30f1c27684f3d728c933115e733ff4e73f03074ed3d584e0795c2598. 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/fc99c2e0-89d6-4385-a907-f0a9fdb7afd0.json and https://artists.proofprofile.net/proofs/artist/fc99c2e0-89d6-4385-a907-f0a9fdb7afd0.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 0x9c6f6b4bcc933ae9195542386ac2985930e3f9f2e1e6a568515d39708a9319c3. 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/QT3FF2506235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9dd5deff29a212bac20fa28d404ec744bd745e75e1611f68102ed96e791d190. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QT3FE2542414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3e959e6c0cb0cf9a38366e8f5c74b9b47d5bedc9d480ea30501190363582335. 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/QT3FE2542448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7be81cf00203961e40e8a1128c884661cf55b66ef69e119acfc14b6fd949c336. 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/QT6E62577325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x972051bce5954f143d7afd983413b3c5065599d78bea58b188036d0d0b5f03cc. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QT3FF2506249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x075931ca46b2f5fd60efd856dda80641232c04f69fd4220ff1b08f0a8af1e916. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZZ7U2564657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab16beba9fb09366689c7c09ea889657c2864c9eb6ae76ac288ba075eaa3854f. 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/QZZ7U2531555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ebcf98667f24629fe4330c97753c51f79630325c9f69a4703d8e16c07f385c0. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZZ7U2531552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e2396df536066cd075f4aa8394b7b4ef4e6525c6af739c60c817d7ad81cf37. 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/QZZ7U2531554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4079ed5f7bd41b7568a714e1a688d6053b067761bc1d7ae25df1b29bb78a6a6. 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/QZZ7U2531550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1782bb61ccd6d0c7424b9db42aa50ea2b2e107794720ae179969f37836293a4. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZZ7V2533316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb18bc69a2c8e478905eaf129872b6e06ee231030054c337a8a3da0f5d32c72d9. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZZ7V2574522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e7dc1d56c79e3dd36033e01f5cb8c7780b8029824e4989617404d7867e51c3. 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/QZZ7V2574523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95392e4d66d1800db405f5a5ca7ef410e4e7aa9ac91c46188df854921c111b21. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZZ7V2574524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0be7dd0c7dde15b1a4cd689e93dcd84b23b3349eaf28b2b92165ab0bd08a1ee9. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QT3F92585416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdad5378183e7cc06861c2a39b1c9fa90f164918f41bba325f5f5aa811e883a49. 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/QZZ7X2520967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cf9f61fe2705bba6e497e15c1eb74debc0753512f37f792b71a9a8d654e3f41. 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/QT3FA2538500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8f5a420cc7103bd2a8f340bc6fd2b25e78eaf83c85396851dc6e5c9fd7f7bc1. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QT3F92585415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x498b7218e7c9fa4fee1a250ce3fd9c75ecc3ed9a2f58593f7a3b04d5d0be417f. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QT3FF2506254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78b5c49ccfc5cc1fc7a160ff35ca23cff66768857a360f84bde767779e0bb322. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QT3FF2574408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf01f5b55c1dd3fa72fdd6d76bf15b0a6c0b42bd0ffa04c3288f1b6728f8e2397. 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/QT3FF2571403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09e24f224a632adc5fb8f56dd0fb77784f932dafc50e27a82a0e50905003e991. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QT3FF2574406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62aabd2b8f15a94f862a26bd8d9c1fe8d639404415c413dbafaee551a78a6760. 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/QT6E62577315.