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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 0x5b89f08a494ea485a546344dd8d4ead50cc21e37038c314b32cba591ca5d2d83. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cf37b53a-37b1-4f34-ba7b-1f6618680f6d.json and https://artists.proofprofile.net/proofs/artist/cf37b53a-37b1-4f34-ba7b-1f6618680f6d.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 0xd141e4a20acc29476f937218d14dd02f8fdb2cd2b6b211713c123ed33155a78c. 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/USL4Q1729804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefda7d9812b5d340b841327b3f41af3a8233d9392eb6722195af2e9e951533b4. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/USL4Q1729805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb1aa82f16d1b635c89f04aaf2ca0b71c9b1ced68670e3037412b6a77b74252. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/USL4Q1729806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1ccff3dd7428a83fc444c95a792bbda7a6e144db3e065f77a6842255554ced0. 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/USL4Q1729807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c638e7356e1054e824e1b5d98e774a4d26c27f7f7a3ee2f595c54e997e1a87c. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/USL4Q1729808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e21e3ae4d97f2f8bbb8ff81998d20a0785c25659dcf46b68afdb2df2bdf54b. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/USL4Q1729809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa02e71988292b7a1ca21b089bc298b18bc0a5f83f1bbb73a11ef06887b385b31. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/USL4Q1729810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e5988de2515ee163b2a897d8db8dbf17d01a4b3ac47441870bebffb3c690ce1. 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/USL4Q1729811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0177f26ef76021d8aa53215adf9e66cb2ba0dfadc832e5cc1a6cefd4425ba76. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USL4Q1729812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31dd87511d6285dd5290d571f9dc9f5a4b861a89fb2cd91c77b2bbb807e766e0. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), 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/USL4Q1729813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0723592e2499e9a1f34a9881fd9899231025d1cf254881fe18551f05cef6612. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/USL4Q1728576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfed3c3a4838c94eec38c18237a09f2232850c63397d248ceb75ebbdc965e73b8. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/USL4Q1728577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a2db8d4fe224b162c5b19ddc29e2fc20a87f93419091ea38d5f1b9900fc7207. 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/USL4Q1728578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1084655e77ab5d55f6fea71c176b4e8dac0c268edac42f0fda70698dfd0a38d2. 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/USL4Q1728579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb382d029b65d088e4932a825dea9d5643afcf891aa23d41460d2d3064dea9190. 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/USL4Q1728580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0492e9ec299237cb986c3d41fdd402d3bf2a8a5842606b557ce2fce5126f6b7. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/USL4Q1728581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd02ab936c6b2870ef169d38da3d2a8bddd83b80f752f1d7b1935b6dd6a36999. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USL4Q1728582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaa3a5ba6aa81677509cce2d3b606c105ab017ec859467a53144ab17a214f63b. 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/USL4Q1728583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d42a673475a6cc49f390693eee65889a33690d00f76f061abe5390e0945838b. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/USL4Q1728584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8818435fed24233c9ea5dd7a999df1cb1a786b11147921364fe9b9b87de0f01a. 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/USL4Q1728585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x710216d4a0e6f78b5e220b22d4b3aae2d1cd039f8c1457de704e5cc00d72469d. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), 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/USCGJ1945585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2836c34665ebbbf5851f99b806561e3e92fed06da23f4795b156cc6b78261b2. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/USMH92330144.